U.S. patent application number 12/872499 was filed with the patent office on 2010-12-30 for photosensitizing transition metal complex and its use for photovoltaic cell.
This patent application is currently assigned to SHARP KABUSHIKI KAISHA. Invention is credited to Atsushi Fukui, Liyuan Han, Ashraful Islam.
Application Number | 20100326529 12/872499 |
Document ID | / |
Family ID | 34525413 |
Filed Date | 2010-12-30 |
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United States Patent
Application |
20100326529 |
Kind Code |
A1 |
Islam; Ashraful ; et
al. |
December 30, 2010 |
PHOTOSENSITIZING TRANSITION METAL COMPLEX AND ITS USE FOR
PHOTOVOLTAIC CELL
Abstract
A photosensitizing transition metal complex of the formula (Ia)
MLY.sup.1, (Ib) MLX.sub.3 (Ic) MLY.sup.2X, (Id) MLY.sup.3X or (Ie)
MLY.sup.4X in which M is a transition metal selected from
ruthenium, osmium, iron, rhenium and technetium, preferably
ruthenium or osmium. X is a co-ligand independently selected from
NCS--, Cl--, Br--, I--, CN--, H.sub.2O; pyridine unsubstituted or
substituted by at least one group selected from vinyl, primary,
secondary or tertiary amine, OH and C.sub.1-30 alkyl, preferably
NSC and CN--; L is a tridentate polypyridine ligand, carrying at
least one carboxylic, phosphoric acid or a chelating group and one
substituted or unsubstituted alkyl group having 1 to 50 carbon
atoms, substituted or unsubstituted alkylamide group having 2 to 30
carbon atoms or substituted or unsubstituted aralkyl group having 7
to 50 carbon atoms. A dye-sensitized electrode includes a substrate
having an electrically conductive surface, an oxide semiconductor
film formed on the conductive surface, and the above sensitizer of
formula (Ia), (Ib), (Ic), (Id) or (Ie) as specified above;
supported on the film. A solar cell includes the above electrode, a
counter electrode, and an electrolyte deposited there between.
Inventors: |
Islam; Ashraful;
(Yamatotakada-shi, JP) ; Han; Liyuan;
(Kitakatsuragi-gun, JP) ; Fukui; Atsushi;
(Kashiba-shi, JP) |
Correspondence
Address: |
NIXON & VANDERHYE, PC
901 NORTH GLEBE ROAD, 11TH FLOOR
ARLINGTON
VA
22203
US
|
Assignee: |
SHARP KABUSHIKI KAISHA
Osaka
JP
|
Family ID: |
34525413 |
Appl. No.: |
12/872499 |
Filed: |
August 31, 2010 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10964745 |
Oct 15, 2004 |
7812251 |
|
|
12872499 |
|
|
|
|
Current U.S.
Class: |
136/263 ; 546/12;
546/5 |
Current CPC
Class: |
H01L 51/0088 20130101;
Y02E 10/542 20130101; H01G 9/2031 20130101; Y02E 10/549 20130101;
H01G 9/2059 20130101; H01L 51/0083 20130101; C07F 15/0053 20130101;
H01L 51/0086 20130101 |
Class at
Publication: |
136/263 ; 546/12;
546/5 |
International
Class: |
H01L 31/04 20060101
H01L031/04; C07F 15/00 20060101 C07F015/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 17, 2003 |
JP |
2003-358266 |
Dec 5, 2003 |
JP |
2003-407877 |
Claims
1. A photosensitizing transition metal complex having the general
formula (Ie): MLY.sup.4X (Ie) in which M is a transition metal
selected from Ru(II), Os(II), Fe(II), Re(I) and Tc(I); L is a
polypyridine ligand having the general formula (II), ##STR00026##
wherein A.sub.1, A.sub.2 and A.sub.3 contain at least one anchoring
group selected from --COOH, --COON(C.sub.4H.sub.9).sub.4,
--PO(OH).sub.2, --PO(OR.sub.1).sub.2 (where R.sub.1 is an alkyl
group having 1 to 30 carbon atoms), --CO(NHOH), and at least one
group selected from an alkyl group having 1 to 50 carbon atoms, an
alkylamide group having 2 to 50 carbon atoms or an aralkyl group
having 7 to 50 carbon atoms; and X is a ligand selected from NCS--,
Cl--, Br--, I--, CN--, NCO--, H.sub.20 or pyridine group which may
be substituted by vinyl, primary, secondary or tertiary amino,
alkylthio, arylthio, hydroxyl or C.sub.1-30 alkyl; and Y.sup.4 is a
group selected from the formulae (IVb-1 to 3), (IVc-1 to 4), (IVd-1
to 8) and (IVe-1 to 2): ##STR00027## ##STR00028## where R.sub.10,
R.sub.11, R.sub.12, R.sub.13, R.sub.14, R.sub.15, R.sub.16 and
R.sub.17 are the same or different an alkyl group having 1 to 20
carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an
perfluoroalkyl group having 2 to 12 carbon atoms, an alkylamide
group having 2 to 12 carbon atoms, an aminoalkyl group having 1 to
12 carbon atoms, an alkoxycarbonyl group having 2 to 6 carbon
atoms, an alkoxy group having 1 to 6 carbon atoms, an aryl group
having 6 to 12 carbon atoms, cyano group, hydroxyl group, nitro
group, amino group, trifluoro group, halogen atom or hydrogen
atom.
2. A photosensitizing transition metal complex of claim 1, which is
a complex of the formula (Ie) where M is Ru(II) or Os(II), X is
NCS-- or CN--, and Y.sup.4 is a group of the formula (IVb-1),
(IVb-2) or (IVb-3).
3. A photosensitizing transition metal complex of claim 1, which is
a complex of the formula (Ie) where M is Ru(II) or Os(II), L is a
polypyrigine ligand of the formula (IIb) ##STR00029## where B.sub.1
and B.sub.2 are, the same or different, a hydrogen atom, --COOH,
--COON(C.sub.4H.sub.9).sub.4, --PO(OH).sub.2, provided that any one
of B.sub.1 and B.sub.2 is different from a hydrogen atom, and C is
an alkyl group having 6 to 30 carbon atoms, Y.sup.4 is a group of
the formula (IVe-1) or (IVe-2), and X is NCS-- or CN--.
4. A photovoltaic cell comprising a support, a conductive layer
formed on the support, and a porous semiconductor layer formed on
the conductive layer, a counter electrode, and an electrolyte
deposited there between wherein the porous semiconductor layer
carries a photosensitizing transition metal complex as claimed in
claim 1.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a divisional of U.S. application
Ser. No. 10/964,745 (allowed), which was filed Oct. 15, 2004
(published as US 2005-0081911 A1 on Apr. 21, 2005), which claims
benefit of Japanese Patent Application Nos. 2003-358266, filed Oct.
17, 2003 and 2003-407877, filed Dec. 5, 2003, the entire contents
of each of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to new photosensitizing transition
metal complex and its use for photovoltaic cell such as solar
cell.
[0004] 2. Description of the Related Art
[0005] Photosensitive dyes are coated on metal oxide films
rendering a device as solar cell effective in the conversion of
visible light to electric energy. In this solar cell, a monolayer
of dye is attached to the surface of nanocrystalline metal dioxide
film. Photoexcitation of the dye results in the injection of an
electron into the conduction band of the metal oxide. The original
state of the dye is subsequently restored by electron donation from
a redox system, such as iodide/triiodide couple. Molecular design
of ruthenium polypyridyl photosensitizers for nanocrystalline
TiO.sub.2 film in solar cell that can absorb visible lights of all
colors presents a challenging task. The dyes should have suitable
ground--and excited state redox properties so that the two key
electron transfer steps (charge injection and regeneration of the
dye) occur efficiently.
[0006] The most efficient transition metal complexes employed so
far in the solar cell are Ru(II) polypyridyl complexes because of
their intense charge-transfer (CT) absorption in the whole visible
range, moderately intense emission with fairly long lifetime in
fluid solution at ambient temperature, high quantum yield for the
formation of the lowest CT excited state, and redox reactivity and
ease of tunability of redox properties. So far, the most successful
photosensitizers employed in solar cell are
Ru(4,4'-dicarboxy-2,2'-bipyridine).sub.2(NCS).sub.2 and
Ru(4,4',4''-tricarboxy-2,2':6',2''-terpyridine)(NCS).sub.3. The
role of the monodentate thiocyanato ligands is to tune the spectral
and redox properties of the photosensitizers by destabilization of
the metal t.sub.2g orbital.
[0007] The presence of monodentate donor ligands (NCS--) can
undergo ligand photosubstitution or photodegradation reaction via
population of an upper lying ligand field excited state and these
processes can be reduced by multidentate ligands.
[0008] As relevant prior arts are mentioned U.S. Pat. No.
6,245,988, U.S. Pat. No. 5,789,592, Japanese Patent Kokai No.
2003-212851 and New J. Chem. 26 (2002) 966-968.
SUMMARY OF THE INVENTION
[0009] The present invention aims to provide a new series of
ptotochemically stable amphiphilic transition metal complexes to
improve the efficiency, durability and stability of dye sensitized
nanocrystalline solar cell.
[0010] According to the invention, there is provided
photosensitizing transition metal complexes represented by the
formulae (Ia), (Ib), (Ic), (Id) and (Ie)
MLY.sup.1 (Ia)
MLX.sub.3 (Ib)
MLY.sup.2X (Ic)
MLY.sup.3X (Id) and
MLY.sup.4X (Ie)
[0011] In the formulae, M is a transition metal selected from
Ru(II), Os(II), Fe(II), Re(I) and Tc(I);
[0012] L is a polypyridine ligand having the general formula
(II):
##STR00001##
wherein at least one of A.sub.1, A.sub.2 and A.sub.3 is an
anchoring group selected from --COOH, --COON(C.sub.4H.sub.9).sub.4,
--PO(OH).sub.2, --PO(OR.sub.1).sub.2 (where R.sub.1 is an alkyl
group having 1 to 30 carbon atoms), --CO(NHOH), and when there is
the remaining A.sub.1, A.sub.2 and A.sub.3 being not said anchoring
group, it may be a hydrogen atom, an alkyl group having 1 to 50
carbon atoms, an alkylamide group having 2 to 50 carbon atoms or an
aralkyl group having 7 to 50 carbon atoms.
[0013] Preferably, A.sub.1, A.sub.2 and A.sub.3 contain at least
one anchoring group as mentioned above and at least one group
selected from the alkyl, alkylamide and aralkyl groups.
[0014] X is a ligand selected from NCS--, Cl--, Br--, I--, CN--,
NCO--, H.sub.2O or pyridine group which may be substituted by
vinyl, primary, secondary or tertiary amino, alkylthio or arylthio,
hydroxyl or C.sub.1-30 alkyl.
[0015] Y.sup.1 is a group selected from the formulae (IIIa) to
(IIId):
##STR00002##
where R.sub.3 is an alkyl group having 1 to 50 carbon atoms, an
alkoxyalkyl group having 2 to 30 carbon atoms, an aminoalkyl group
having 1 to 30 carbon atoms, an alkoxycarbonyl group having 2 to 20
carbon atoms, an alkylamide group having 2 to 30 carbon atoms, a
cyano group or a hydrogen atom.
[0016] Y.sup.2 is a group having the general formula (IVa-1):
##STR00003##
where R.sub.4, R.sub.5 and R.sub.6 are independently an alkyl group
having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 12
carbon atoms, an aminoalkyl group having 1 to 12 carbon atoms, an
alkoxycarbonyl group having 2 to 6 carbon atoms, an alkylamide
group having 2 to 30 carbon atoms, a perfluoroalkyl group having 1
to 12 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an
aryl group, cyano group, hydroxyl group, nitro group, amino group,
trifluoro group, halogen atom or hydrogen atom.
[0017] Y.sup.3 is a group having the formula (IVa-2):
##STR00004##
where R.sub.7 is a trifluoro or perfluoroalkyl group having 1 to 12
carbon atoms, R.sub.8 and R.sub.9 are independently the same
meanings as R.sub.5 and R.sub.6 of the formula (IVa-1).
[0018] Y.sup.4 is a group selected from the formulae (IVb-1 to 3),
(IVc-1 to 4), (IVd-1 to 8) and (IVe-1 or 2):
##STR00005## ##STR00006##
where R.sub.10, R.sub.11, R.sub.12, R.sub.13, R.sub.14, R.sub.15,
R.sub.16 and R.sub.17 are the same or different an alkyl group
having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 12
carbon atoms, an perfluoroalkyl group having 2 to 12 carbon atoms,
an alkylamide group having 2 to 12 carbon atoms, an aminoalkyl
group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2
to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an
aryl group, cyano group, hydroxyl group, nitro group, amino group,
trifluoro group, halogen atom or hydrogen atom.
[0019] The present invention further provides a photovoltaic cell
comprising a support, a conductive layer formed on the support, and
a porous semiconductor layer formed on the conductive layer,
wherein the porous semiconductor layer carries a photosensitizing
transition metal complex as defined above.
[0020] These and other objects of the present application will
become more readily apparent from the detailed description given
hereinafter. However, it should be understood that the detailed
description and specific examples, while indicating preferred
embodiments of the invention, are given by way of illustration
only, since various changes and modifications within the spirit and
scope of the invention will become apparent to those skilled in the
art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 is a diagrammatic sectional view showing the
structure of a solar cell constructed in the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE
INVENTION
[0022] In the formulae (Ia) to (Ie), the symbols or groups will be
explained in detail.
[0023] The transition metal for M is preferred to be Ru(II) and
Os(II).
[0024] The ligand for X is preferred to be NCS-- and CN--.
[0025] The polytpyridine ligand for the general formula (II) is
preferred to be those of the subformula (IIa):
##STR00007##
where B.sub.1, B.sub.2 and B.sub.3 are H, --COOH,
--COON(C.sub.4H.sub.9).sub.4 or --PO(OH).sub.2 provided that at
least one of B.sub.1, B.sub.2 and B.sub.3 is different from
hydrogen atom; and subformula (IIb):
##STR00008##
where B.sub.1 and B.sub.2 are, the same or different, a hydrogen
atom, --COOH, --COON(C.sub.4H.sub.9).sub.4, --PO(OH).sub.2,
provided that any one of B.sub.1 and B.sub.2 is different from a
hydrogen atom, and C is an alkyl group having 6 to 30 carbon
atoms.
[0026] The alkyl moiety used in the alkyl group, the alkylamide
group, the aralkyl group, the alkoxyalkyl group, the aminoalkyl
group, the alkoxycarbonyl group, the alkylthio group, the tri or
perfluoro alkyl may be either straight chain or branched chain and
further may be optionally substituted by any group(s) which does
not interfere the property for photosensitizer.
[0027] The aryl moiety used in the aralkyl group may be optionally
substituted by any group(s) which does not interfere the property
for photosensitizer.
[0028] Preferred polypyridine ligands for L which can contribute
for the best to increase the efficiency and stability of
photovoltaic cell are those having at least one anchoring group of
--COOH and --PO(OH).sub.2, specifically as mentioned below.
##STR00009##
[0029] Specifically, preferred illustrative examples of the
photosensitizing transition metal complexes of the general formula
(Ia) are ruthenium complexes as shown by Complex types 1 to 4 in
Table 1 to 4.
Complex Type 1:
##STR00010##
TABLE-US-00001 [0030] TABLE 1 Complex type No A.sub.1 A.sub.2
A.sub.3 1a COOH COOH COOH 1b COOH COOH nC.sub.19H.sub.39 1c COOH
COOH nCH(C.sub.12H.sub.25).sub.2 1d nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 1e COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39 1f
COOH COOH nC.sub.17H.sub.35 1g COOH COOH nCH(C.sub.8H.sub.17).sub.2
1h nC.sub.17H.sub.35 COOH nC.sub.17H.sub.35 1i COOH
nC.sub.8H.sub.17 nC.sub.9H.sub.19
Complex Type 2:
##STR00011##
TABLE-US-00002 [0031] TABLE 2 Complex type No A.sub.1 A.sub.2
A.sub.3 2a COOH COOH COOH 2b COOH COOH nC.sub.19H.sub.39 2c COOH
COOH nCH(C.sub.12H.sub.25).sub.2 2d nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 2e COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
Complex Type 3:
##STR00012##
TABLE-US-00003 [0032] TABLE 3 Complex type No A.sub.1 A.sub.2
A.sub.3 R.sub.3 3a COOH COOH COOH H 3b COOH COOH COOH
nC.sub.16H.sub.33 3c COOH COOH nC.sub.19H.sub.39 H 3d COOH COOH
nC.sub.19H.sub.39 nC.sub.16H.sub.33 3e COOH COOH
nCH(C.sub.12H.sub.25).sub.2 H 3f nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 H 3g COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39 H
3h COOH COOH nC.sub.17H.sub.35 H 3i COOH COOH
nCH(C.sub.8H.sub.17).sub.2 H 3j nC.sub.17H.sub.35 COOH
nC.sub.17H.sub.35 H 3k COOH NC.sub.8H.sub.17 NC.sub.9H.sub.19 H
Complex Type 4:
##STR00013##
TABLE-US-00004 [0033] TABLE 4 Complex type No A.sub.1 A.sub.2
A.sub.3 4a COOH COOH COOH 4b COOH COOH NC.sub.19H.sub.39 4c COOH
COOH nCH(C.sub.12H.sub.25).sub.2 4d nC.sub.19H.sub.39 COOH
NC.sub.19H.sub.39 4e COOH nC.sub.16H.sub.33 NC.sub.19H.sub.39
[0034] Specifically, preferred illustrative examples of the
photosensitizing transition metal complex of the general formula
(Ib) are ruthenium complexes as shown by Complex type 5 in Table
5.
Complex Type 5:
##STR00014##
TABLE-US-00005 [0035] TABLE 5 Complex type No A.sub.1 A.sub.2
A.sub.3 X 5a COOH COOH nC.sub.19H.sub.39 NSC- 5b COOH COOH
nCH(C.sub.12H.sub.25).sub.2 NSC- 5c nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 NSC- 5d COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
NSC-
[0036] Specifically, preferred illustrative examples of the
photosensitizing transition metal complex of the general formula
(Ic) are ruthenium complexes as shown by Complex type 6 in Table 6
and 7.
Complex Type 6:
##STR00015##
TABLE-US-00006 [0037] TABLE 6 R.sub.4 R.sub.5 R.sub.6 No CH.sub.3 H
CH.sub.3 1 CH.sub.3 CH3 CH.sub.3 2 t-Bu H t-Bu 3 Ph H CH.sub.3 4 Ph
H Ph 5 CH.sub.3 H R.sub.1 6 CF.sub.3 H CH.sub.3 7 CF.sub.3 H
CH.sub.2CN 8 CF.sub.3 H CF.sub.3 9 CF.sub.3 H R.sub.1 10 CF.sub.3 H
CF.sub.3--CF.sub.2 11 CF.sub.3 H Ph 12 R.sub.1 being selected from
C.sub.1-30 alkyl
TABLE-US-00007 TABLE 7 Complex type No A.sub.1 A.sub.2 A.sub.3
R.sub.4 R.sub.6 X 6a COOH COOH nC.sub.19H.sub.39 CF.sub.3 CH.sub.3
NSC- 6b COOH COOH nCH(C.sub.12H.sub.25).sub.2 CF.sub.3 CH.sub.3
NSC- 6c nC.sub.19H.sub.39 COOH nC.sub.19H.sub.39 CF.sub.3 CH.sub.3
NSC- 6d COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39 CF.sub.3 CH.sub.3
NSC- 6e COOH COOH NC.sub.17H.sub.35 CF.sub.3 CH.sub.3 NSC- 6f COOH
COOH nCH(C.sub.8H.sub.17).sub.2 CF.sub.3 CH.sub.3 NSC- 6g
nC.sub.17H.sub.35 COOH nC.sub.17H.sub.35 CF.sub.3 CH.sub.3 NSC- 6h
COOH NC.sub.8H.sub.17 NC.sub.9H.sub.19 CF.sub.3 CH.sub.3 NSC-
[0038] Specifically, preferred illustrative examples of the
photosensitizing transition metal complex of the general formula
(Id) are ruthenium complexes as shown by Complex type 7 in Table 8
and 9.
Complex Type 7:
##STR00016##
TABLE-US-00008 [0039] TABLE 8 R.sub.7 R.sub.8 R.sub.9 No CF.sub.3 H
4-F 1 CF.sub.3 H 4-Cl 2 CF.sub.3 H 4 -CN 3 CF.sub.3 H 4-CF.sub.3 4
CF.sub.3 H 4-CH.sub.3 5 CF.sub.3 H 4-NO.sub.2 6 CF.sub.3--CF.sub.2
H 4-F 7 CF.sub.3--CF.sub.2 H 4-Cl 8 CF.sub.3--CF.sub.2 H 4-CN 9
CF.sub.3 F 4-F 10 CF.sub.3 F 4-Cl 11 CF.sub.3 F 4-CN 12 CF.sub.3 F
4-CF.sub.3 13 CF.sub.3 F 4-CH.sub.3 14 CF.sub.3 H H 15
CF.sub.3--CF.sub.2 H 4-CF.sub.3 16 CF.sub.3--CF.sub.2 H 4-CH.sub.3
17 CF.sub.3--CF.sub.2 H H 18
TABLE-US-00009 TABLE 9 Complex type No A.sub.1 A.sub.2 A.sub.3
R.sub.7 R.sub.9 X 7a COOH COOH COOH CF.sub.3 H NSC- 7b COOH COOH
COOH CF.sub.3 F NSC- 7c COOH COOH COOH CF.sub.3 Cl NSC- 7d COOH
COOH COOH CF.sub.3 CH.sub.3 NSC- 7e COOH COOH nC.sub.19H.sub.39
CF.sub.3 CH.sub.3 NSC- 7f COOH COOH nCH(C.sub.12H.sub.25).sub.2
CF.sub.3 CH.sub.3 NSC- 7g nC.sub.19H.sub.39 COOH nC.sub.19H.sub.39
CF.sub.3 CH.sub.3 NSC- 7h COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
CF.sub.3 CH.sub.3 NSC- 7i COOH COOH NC.sub.17H.sub.35 CF.sub.3
CH.sub.3 NSC- 7j COOH COOH nCH(C.sub.8H.sub.17).sub.2 CF.sub.3
CH.sub.3 NSC- 7k nC.sub.17H.sub.35 COOH nC.sub.17H.sub.35 CF.sub.3
CH.sub.3 NSC- 7l COOH NC.sub.8H.sub.17 NC.sub.9H.sub.19 CF.sub.3
CH.sub.3 NSC- 7m COOH COOH nC.sub.19H.sub.39 CF.sub.3 F NSC- 7n
COOH COOH nCH(C.sub.12H.sub.25).sub.2 CF.sub.3 F NSC- 7o
nC.sub.19H.sub.39 COOH nC.sub.19H.sub.39 CF.sub.3 F NSC- 7p COOH
nC.sub.16H.sub.33 nC.sub.19H.sub.39 CF.sub.3 F NSC- 7q COOH COOH
NC.sub.17H.sub.35 CF.sub.3 F NSC- 7r COOH COOH
nCH(C.sub.8H.sub.17).sub.2 CF.sub.3 F NSC- 7s nC.sub.17H.sub.35
COOH nC.sub.17H.sub.35 CF.sub.3 F NSC- 7t COOH NC.sub.8H.sub.17
NC.sub.9H.sub.19 CF.sub.3 F NSC- 7u COOH COOH COOH CF.sub.3
CF.sub.3 NSC-
[0040] Specifically, preferred illustrative examples of the
photosensitizing transition metal complexes of the general formula
(Ie) are ruthenium complexes as shown by Complex types 8 to 11 in
Table 10 to 13.
Complex Type 8:
##STR00017##
TABLE-US-00010 [0041] TABLE 10 Complex type No A.sub.1 A.sub.2
A.sub.3 X 8a COOH COOH nC.sub.19H.sub.39 NSC- 8b COOH COOH
nCH(C.sub.12H.sub.25).sub.2 NSC- 8c nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 NSC- 8d COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
NSC-
Complex Type 9:
##STR00018##
TABLE-US-00011 [0042] TABLE 11 Complex type No A.sub.1 A.sub.2
A.sub.3 X 9a COOH COOH nC.sub.19H.sub.39 NSC- 9b COOH COOH
nCH(C.sub.12H.sub.25).sub.2 NSC- 9c nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 NSC- 9d COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
NSC-
Complex Type 10:
##STR00019##
TABLE-US-00012 [0043] TABLE 12 Complex type No A1 A2 A3 X 10a COOH
COOH nC.sub.19H.sub.39 NSC- 10b COOH COOH
nCH(C.sub.12H.sub.25).sub.2 NSC- 10c nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 NSC- 10d COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
NSC-
Complex Type 11:
##STR00020##
TABLE-US-00013 [0044] TABLE 13 Complex type No A1 A2 A3 X 11a COOH
COOH nC.sub.19H.sub.39 NSC- 11b COOH COOH
nCH(C.sub.12H.sub.25).sub.2 NSC- 11c nC.sub.19H.sub.39 COOH
nC.sub.19H.sub.39 NSC- 11d COOH nC.sub.16H.sub.33 nC.sub.19H.sub.39
NSC-
[0045] An embodiment of the present invention will be described
with reference to FIG. 1. A dye-sensitized solar cell shown in FIG.
1 has such a structure containing an electroconductive support 8, a
porous photovoltaic layer 3 having a photosensitizing dye adsorbed
thereon and/or therein formed on the electroconductive support 8, a
counter electrode side 9, a hole transporting layer 4 filled
between the porous photovoltaic layer 3 and the counter electrode
side 9, and a sealant 7 sealing the side surfaces. The
electroconductive support 8 is constituted with a substrate 1 and a
transparent electroconductive film 2. The material used in the
substrate 1 is not particularly limited and can be various kinds of
transparent materials, and glass is preferably used. The material
used in the transparent electroconductive film 2 is also not
particularly limited, and it is preferred to use a transparent
electroconductive metallic oxide electrode such as fluorine-doped
tin oxide (SnO.sub.2:F), antimony doped tin oxide (SnO.sub.2:Sb),
indium-doped tin oxide (In.sub.2O.sub.3:Sn), aluminium-doped zinc
oxide (ZnO:Al) and gallium-doped zinc oxide (ZnO:Ga). Examples of
the method for forming the transparent electroconductive film 2 on
the substrate 1 include a vacuum vapor deposition method, a
sputtering method, a CVD (chemical vapor deposition) method and a
PVD (physical vapor deposition) method using a component of the
material, and a coating method by a sol-gel method.
[0046] The material of the porous semiconductor layer used in the
porous photovoltaic layer 3 is not particularly limited as far as
it is an n-type semiconductor. It is preferred to use an oxide
semiconductor such as titanium oxide (TiO.sub.2), zinc oxide (ZnO),
tin oxide (SnO.sub.2), indium oxide (In.sub.2O.sub.3) and niobium
oxide (Nb.sub.2O.sub.3). It is preferred that the oxide
semiconductor have a large surface area for reasons of obtaining
high performance of a solar cell. Thus, the oxide semiconductor
preferably has a particle diameter of 1 to 200 nm, more preferably
50 nm or less. The oxide semiconductor preferably has a specific
surface area of 5 to 100 m2/g. The oxide semiconductor is
immobilized on the conductive surface to form a generally porous
film having a thickness of at least 200 nm, preferably 1000 to
20000 nm.
[0047] A dye sensitized semiconductor electrode according to the
present invention may be obtained by fixing the above described
metal complex of the present invention to a film or layer of oxide
semiconductor particles formed on an electrically conductive
surface of a substrate in any suitable conventional manner.
[0048] Fixation of the oxide semiconductor on the conductive
surface may be effected by dipping or coating in or with a
suspension or slurry containing the oxide semiconductor, followed
by drying and calcination. A water medium, which may contain a
surfactant, a thickening agent such as polyethylene glycol and any
suitable additive, is generally used for forming the suspension or
slurry. The calcination is generally carried out at 300 to
900.degree. C., preferably 400 to 600.degree. C.
[0049] The metal complex is fixed to the semiconductor layer. The
metal complex is dissolved in a suitable solvent such as methanol,
ethanol, acetonitrile, n-butanol, tert-butanol or
dimethylformamide. The above described semiconductor electrode is
then impregnated with this solution by immersion, coating or any
other suitable method. It is preferred that the solution penetrates
deep into the porous layer of the oxide semiconductor. Thus, the
semiconductor electrode is preferably evacuated at an elevated
temperature to remove gases trapped therein. The metal complex
preferably forms a monolayer on surfaces of the oxide
semiconductor.
[0050] The support on a counter electrode side 9 is constituted by
a substrate 5 and a counter electrode layer 6. The material used
for the substrate 5 is not particularly limited as similar to the
substrate 1, and it can be various kinds of transparent materials,
with glass being preferably used. The material used for the counter
electrode layer 6 is also not particularly limited, and one of a
platinum thin film, a carbon thin film, fluorine-doped tin oxide
(SnO.sub.2:F), antimony doped tin oxide (SnO.sub.2:Sb), tin-doped
indium oxide (In.sub.2O.sub.3:Sn), aluminium-doped zinc oxide
(ZnO:Al) and gallium-doped zinc oxide (ZnO:Ga), an accumulated
layer of plurality thereof, and a composite film of plurality
thereof are preferably used. The role of the counter electrode
layer 6 is to facilitate the transfer of electrons from the counter
electrode to the electrolyte. Examples of the method for forming
the counter electrode film 6 on the substrate 5 include a vacuum
vapor deposition method, a sputtering method, a CVD (chemical vapor
deposition) method and a PVD (physical vapor deposition) method
using a component of the material, and a coating method by a
sol-gel method. A further possible modification of the
counterelectrode is to make it reflective to light that has passed
through the electrolyte and the first plate. Further the outside of
the substrates may be coated with plastics like PS, PMMA, or
preferably PC to protect the TiO2 layer, the dyestuff and the
electrolyte against UV-light to give long term stability.
[0051] In the present invention, as the hole transporting layer 4
filled between the porous semiconductor layer 3 having the
photosensitizing dye adsorbed thereon formed on the
electroconductive support 8 and the support on a counter electrode
side 9, materials that can transport an electron, a hole or an ion
can be used. For example, a hole transporting material such as
polyvinyl carbazole, an electron transporting material such as
tetranitrofluorenone, an electroconductive polymer such as
polypyrrol, a liquid electrolyte, and an ionic electroconductive
material such as a polymer solid electrolyte, can be used.
[0052] Illustrative of the redox pairs for a liquid electrolyte are
I--/I.sub.3--, Br--/Br.sub.3-- and quinone/hydroquinone pairs. In
the case of I--/I.sub.3--, for example, lithium iodide and iodine
may be used. As a solvent for the electrolyte, there may be used an
electrochemically inert solvent capable of dissolving the
electrolyte in a large amount, such as acetonitrile or propylene
carbonate.
[0053] The following examples of the present invention will further
illustrate.
Example 1
Preparation of
4,4',4''-trimethoxycarbonyl-2,2':6',2''-terpyridine
[0054] This compound was prepared by an analogous procedure to that
described in J. Am. Chem. Soc. 123 (2001) 1613.
Example 2
Preparation of
4,4'-diethoxycarbonyl-4''(nonadecyl)-2,2':6',2''-terpyridine, a
Compound of the Formula (II2)
##STR00021##
[0055] (a) Preparation of 4-nonadecylpyridine (1)
[0056] Into a 300-mL flask equipped with a mechanical stirrer,
N.sub.2 inlet, pressure-equalizing addition funnel which is
thermostated in oil bath, were added 14.8 g of sodium amide (0.38
mol) and 64.0 mL of 4-methylpyridine (61.1 g, 0.656 mol). The
mixture was stirred under N.sub.2 for 1 h while a color change to
deep red was observed. A 110-mL sample of n-octadecyl chloride
(95.0 g; 0.33 mol) was added to the rapidly stirred reaction
mixture over a period of 1.5 h. Shortly after addition was begun,
the reaction mixture was warmed to 60.degree. C. to prevent
solidification and was subsequently stirred overnight at
100.degree. C. The reaction mixture was cooled to room temperature,
diluted with 200 mL of chloroform, washed three times with 200 mL
of H.sub.2O, and reduced to dryness with the rotary evaporator. The
resultant dark brown product was vacuum distilled three times at
0.07 mmHg to finally afford 48.8 g of constant-boiling (180.degree.
C. (0.07 mmHg)), white, waxy solid (0.141 mol, 43% yield based on
n-octadecyl chloride). Anal. Calcd for C.sub.24H.sub.43N: C, 83.41;
H, 12.54; N, 4.05. Found: C, 83.6; H, 12.7; N, 4.0. MS (ESIMS):
m/z: 345.3.
(b) Preparation of 2-amino-4-nonadecylpyridine (2)
[0057] A mixture of 0.5 molar portion of 4-nonadecylpyridine, 0.59
mole of sodium amide and 1.18 moles of N,N-dimethylaniline was
heated at 150.degree. C. for six hours. The reaction mixture, after
cooling, was poured into water, and the dimethylaniline layer was
separated and dried over anhydrous potassium carbonate. After
removal of the solvent in vacuo the residue was stirred in
petroleum ether and crystallized from ethyl acetate/ligroin. Yield
45%. Anal. Calcd for C.sub.24H.sub.44N.sub.2: C, 79.93; H, 12.30;
N, 7.77. Found: C, 79.63; H, 12.40; N, 7.60. MS (ESIMS): m/z:
360.4.
(c) 2-Bromo-4-nonadecylpyridine (3)
[0058] Powdered 2-amino-4-nonadecylpyridine (110.6 g, 0.31 mol) was
added under vigorous stirring in portions to 48% hydrobromic acid
(500 mL) at 20 to 30.degree. C. in a 4-L glass reactor. After all
of the compound was dissolved, the mixture was cooled at
-20.degree. C. To this suspension was added cooled bromine (44.3
mL, 0.86 mol) dropwise over 30 min, maintaining the temperature at
-20.degree. C. The resulting paste was stirred for 90 min at this
temperature. Then sodium nitrite (56.6 g, 0.82 mol) in water (250
mL) was added dropwise. After that the reaction mixture was allowed
to warm to 15.degree. C. over 1 h and was stirred for an additional
45 min. The mixture was cooled to -20.degree. C. and treated with
cooled aqueous NaOH (222 g, 330 mL H.sub.2O). During the addition
the temperature was kept at -10.degree. C. maximum. The mixture was
allowed to warm to room temperature and stirred for 1 h. The
mixture was extracted with ethyl acetate, the organic phase was
dried with Na.sub.2SO.sub.4, and the solvent was removed in vacuo.
The residue was subjected to distillation in vacuo to yield the
desired. Yield 50%. Anal. Calcd for C.sub.24H.sub.42BrN: C, 67.90;
H, 9.97; N, 3.30. Found: C, 67.50; H, 9.87; N, 3.40. MS (ESIMS):
m/z: 423.3.
(d) Preparation of 2-tributyl(4-nonadecylpyridine-2-yl)stannane
(4)
[0059] To 2-bromo-4-nonadecylpyridine (70.0 g, 165 mmol) in
absolute THF (400 mL) at -78.degree. C. was added dropwise
n-butyllithium (110 mL, 178 mmol, 1.6 M in hexane). After the
solution was stirred at -78.degree. C. for 90 min,
tributyltinchloride (53.6 mL, 198 mmol) was added, and the mixture
was allowed to warm to room temperature. Water (90 mL) was poured
into the reaction mixture, and the phases were separated. The
aqueous layer was extracted with diethyl ether (4.times.200 mL).
The combined organic phases were dried over Na.sub.2SO.sub.4, and
the solvent was removed in vacuo. The resulting oil was purified by
fractionated Kugelrohr distillation. Selected analytical data
follows. Yield: 55%. Anal. C.sub.36H.sub.69NSn: Calcd: C, 68.13; H,
10.96; N, 2.21; Found: C, 68.65; H, 10.76; N, 2.27;. MS (ESIMS):
m/z: 635.4.
(e) Preparation of 2-tributylstannyl-picolines (5)
[0060] To 2-bromo-picoline (28.4 g, 165 mmol) in absolute THF (250
mL) at -78.degree. C. was added dropwise n-butyllithium (110 mL,
178 mmol, 1.6 M in hexane). After the solution was stirred at
-78.degree. C. for 90 min, tributyltinchloride (53.6 mL, 198 mmol)
was added, and the mixture was allowed to warm to room temperature.
Water (90 mL) was poured into the reaction mixture, and the phases
were separated. The aqueous layer was extracted with diethyl ether
(4.times.200 mL). The combined organic phases were dried over
Na.sub.2SO.sub.4, and the solvent was removed in vacuo. The
resulting oil was purified by fractionated Kugelrohr distillation.
Colorless liquid, by 120.degree. C. (2.5.times.10.sup.-5 mbar),
Yield 60%; Anal. C.sub.18H.sub.33NSn: Calcd: C, 56.56; H, 8.64; N,
3.67; Found: C, 56.22; H, 8.70; N, 3.21. MS (ESIMS): m/z:
383.2.
(f) Preparation of 2,6-dihydroxy-4-methylpyridine (6)
[0061] A mixture of 2,6-dihydroxy-3-cyano-4-methylpyridine (4.32 g,
28.8 mmol), concentrated H.sub.2SO.sub.4(12 mL) and water (10 mL)
was heated under reflux for 5 h. The mixture was cooled with ice
and neutralized with solid NaHCO.sub.3. The precipitate was
filtered, washed with water and Et.sub.2O and dried in vacuo to
give a mixture of 2,6-dihydroxy-4-methylpyridine and of the free
acid, which was not decarboxylated. The mixture was used without
further purification for the next reaction step. Yield: 72%. Anal.
C.sub.6H.sub.7NO.sub.2: Calcd: C, 57.59; H, 5.64; N, 11.19; O,
25.57; Found: C, 57.74; H, 5.55; N, 11.19; O, 25.66. MS (ESIMS):
m/z: 125.0.
(g) Preparation of 2,6-dibromo-4-methylpyridine (7)
[0062] Compound 6 (1.0 g, 7.93 mmol) and POBr.sub.3 (7.26 g, 25.33
mmol) were ground and melted together at 140-150 C for 1 h. After
cooling, the mixture was quenched with water, neutralized with
solid NaHCO.sub.3 and extracted with CHCl.sub.3 (3.times.100 mL).
The combined organic phases were washed with water and purified by
column chromatography on silica with hexane/EOAc (9/1, v/v) to give
2,6-dibromo-4-methylpyridine as a colorless oil. Yield: 58%. Anal.
C.sub.6H.sub.5Br.sub.2N: Calcd: C, 28.72; H, 2.01; N, 5.58; Found:
C, 28.58; H, 2.07; N, 5.46. MS (ESIMS): m/z: 250.9.
(h) Preparation of 6-bromo-4,4'-dimethyl-2,2'-bipyridine (8)
[0063] Dibromocompound 2,6-dibromo-4-methylpyridine (1 mmol),
2-tributylstannyl-picolines (1 mol) and (Ph.sub.3Ph)4Pd (0.01
equiv) were heated under N.sub.2 in toluene (50 mL) for 16 h. Upon
cooling to room temperature aqueous saturated NH.sub.4Cl solution
(20 mL) was added. The mixture was stirred for further 30 min and
then filtered over Celite. The precipitate was washed with
CH.sub.2Cl.sub.2 (50 mL) and the organic phase was separated. The
aqueous phase was extracted with toluene. The combined organic
phases were dried (MgSO.sub.4) and the solvent was removed.
Concentrated HCl (30 mL) was added to the residue followed by
extracting with CH.sub.2Cl.sub.2. The aqueous phase was cautiously
neutralized by solid NaOH. The product was then extracted with
CH.sub.2Cl.sub.2 and dried. The solvent was removed and the product
purified by chromatography on silica gel with
CH.sub.2Cl.sub.2/hexane (1:2) as eluent. Yield: 25%. Anal.
C.sub.12H.sub.11BrN.sub.2: Calcd: C, 54.77; H, 4.21; N, 10.65;
Found: C, 54.54; H, 4.30; N, 10.45. MS (ESIMS): m/z: 262.0.
(i) Preparation of 6-bromo-4,4'-dicarboxy-2,2'-bipyridine (9)
[0064] To a stirring solution of sulfuric acid (98%, 125 mL), 5.37
g (20.5 mmoles) of 6-bromo-4,4'-dimethyl-2,2'-bipyridine was added.
With efficient stirring, 24 g (81.5 mmoles) of potassium dichromate
was then added in small portions, such that the temperature
remained between 70 and 80.degree. C. Occasional cooling in a water
bath was usually necessary during the addition of potassium
dichromate. After all the potassium dichromate was added, the
reaction stirred at room temperature until the temperature fell
below 40.degree. C. The deep green reaction mixture was poured into
800 mL of ice water and filtered. The solid was washed with water
until the filtrate was colorless and allowed to dry. The resulting
light yellow solid was then further purified by refluxing it in 170
mL of 50% nitric acid for 4 hours. This solution was poured over
ice, diluted with 1 L of water and cooled to 5.degree. C. The
precipitate was filtered, washed with water (5.times.50 mL), then
acetone (2.times.20 mL) and allowed to dry giving 6.2 g (94%) of
6-bromo-4,4'-dicarboxy-2,2'-bipyridine as a fine white solid. Anal.
C.sub.12H.sub.7BrN.sub.2O.sub.4: Calcd: C, 44.61; H, 2.18; N, 8.67;
Found: C, 44.23; H, 2.14; N, 8.56. MS (ESIMS): m/z: 322.0.
(j) Preparation of 6-bromo-4,4'-diethoxycarbonyl-2,2'-bipyridine
(10)
[0065] To a suspension of 6-bromo-4,4'-dicarboxy-2,2'bipyridine
(6.6 g, 20.5 mmol) in 400 mL of absolute ethanol was added 5 mL of
concentrated sulfuric acid. The mixture was refluxed for 80 h to
obtain a clear solution and then cooled to room temperature. Water
(400 mL) was added and the excess ethanol removed under vacuum. The
pH was adjusted to neutral with NaOH solution, and the resulting
precipitate was filtered and washed with water (pH=7). The solid
was dried to obtain 7.0 g (90%) of
6-bromo-4,4'-diethoxycarbonyl-2,2'-bipyridine. Anal.
C.sub.16H.sub.15BrN.sub.2O.sub.4: Calcd: C, 50.68; H, 3.99; N,
7.39; Found: C, 50.45; H, 3.92; N, 7.33. MS (ESIMS): m/z:
378.0.
(k) Preparation of
4,4'-diethoxycarbonyl-4''(nonadecyl)-2,2':6',2''-terpyridine
(11)
[0066] 6-Bromo-4,4'-diethoxycarbonyl-2,2'-bipyridine (10) (1 mmol),
2-tributyl(4-nonadecylpyridine-2-yl)stannane (4) (1 mmol) and
(Ph.sub.3P)4Pd (0.01 equiv) were heated under N.sub.2 in toluene
(50 mL) for 16 h. Upon cooling to room temperature aqueous
saturated NH4Cl solution (20 mL) was added. The mixture was stirred
for further 30 min and then filtered over celite. The precipitate
was washed with CH.sub.2Cl.sub.2 (50 mL) and the organic phase was
separated. The aqueous phase was extracted with toluene. The
combined organic phase were dried (MgSO.sub.4) and the solvent was
removed. Concentrated HCl (30 mL) was added to the residue and
extracted with CH.sub.2Cl.sub.2. The aqueous phase was cautiously
neutralized by solid NaOH. The product was then extracted with
CH.sub.2Cl.sub.2 and dried. The solvent was removed and the product
purified by chromatography on silica gel with
CH.sub.2Cl.sub.2/hexane (1:2) as eluent. Yield: 25%. Anal.
C.sub.40H.sub.57N.sub.3O.sub.4: Calcd: C, 74.61; H, 8.92; N, 6.53;
Found: C, 74.22; H, 8.72; N, 6.49. MS (ESIMS): m/z: 643.4.
Example 3
Preparation of
4,4'-diethoxycarbonyl-4''-(didodecylmethyl)-2,2':6',2''-terpyridine,
a Compound of the Formula (II3)
##STR00022##
[0067] (a) Preparation of 4-(didodecylmethyl)pyridine (1)
[0068] A solution of butyllithium (1.6 M in hexane; 2.05 equiv.)
was added to a solution of diisopropylamine (0.2 M; 2.1 equiv.) in
dry ether at -15.degree. C. After stirring for 30 min, freshly
distilled 4-methylpyridine (1 eqiv.) was added dropwise. The
resulting red solution was stirred for 15 min at -15.degree. C. and
then a solution of alkyl halide (1 M; 2.05 equiv.) in dry ether was
added in one portion. The mixture was stirred overnight at room
temperature. Ether was added and the reaction mixture was washed
twice with 1 M NH.sub.4Cl solution, dried with Na.sub.2SO.sub.4 and
evaporated to dryness. The product was purified by chromatography
on Al.sub.2O.sub.3 (neutral), gradient-eluting with hexane and
finally hexane/ether (5:1) to give the product in yield 70%. Anal.
C.sub.30H.sub.55N: Calcd: C, 83.84; H, 12.90; N, 3.26; Found: C,
83.55; H, 12.84; N, 3.21. MS (ESIMS): m/z: 429.4.
(b) Preparation of 2-amino-4-didodecylmethyl-pyridine (2)
[0069] This compound was prepared by an analogous procedure to that
described in Example 2 (step b). Anal. C.sub.30H.sub.56N.sub.2:
Calcd: C, 81.01; H, 12.69; N, 6.30; Found: C, 81.11; H, 12.77; N,
6.25. MS (ESIMS): m/z: 444.8.
(c) Preparation of 2-Bromo-4-didodecylmethyl-pyridine (3)
[0070] This compound was prepared by an analogous procedure to that
described in Example 2 (step c). Anal. C.sub.30H.sub.54BrN: Calcd:
C, 70.84; H, 10.70; N, 2.75; Found: C, 70.45; H, 10.67; N, 2.69. MS
(ESIMS): m/z: 507.3.
(d) Preparation of 2-tributyl(4-didodecylmethyl-2-yl)stannane
(4)
[0071] This compound was prepared by an analogous procedure to that
described in Example 2 (step d). Anal. C.sub.42H.sub.81NSn: Calcd:
C, 70.18; H, 11.36; N, 1.95; Found: C, 70.0; H, 11.31; N, 1.97. MS
(ESIMS): m/z: 719.5.
(e) Preparation of 6-bromo-4,4'-diethoxycarbonyl-2,2'-bipyridine
(5)
[0072] This compound was prepared by an analogous procedure to that
described in Example 2 (step e-j). Anal.
C.sub.16H.sub.15BrN.sub.2O.sub.4: Calcd: C, 50.68; H, 3.99; N,
7.39; Found: C, 50.35; H, 3.78; N, 7.34. MS (ESIMS): m/z:
379.02
(f) Preparation of
4,4'-diethoxycarbonyl-4''-didodecylmethyl-2,2':6',2''-terpyridine
(6)
[0073] This compound was prepared by an analogous procedure to that
described in Example 2 (step k). Anal.
C.sub.46H.sub.69N.sub.3O.sub.4: Calcd: C, 75.89; H, 9.55; N, 5.77;
O, 8.79; Found: C, 75.89; H, 9.55; N, 5.77; O, 8.79. MS (ESIMS):
m/z: 728.0.
Example 4
Preparation of
4,4'-bis(diethylphosphonato)-4''-nonadecyl-2,2':6',2''-terpyridine,
a Compound of the Formula (II4)
##STR00023##
[0074] (a) Preparation of
4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine
[0075] This compound was prepared by an analogous procedure to that
described in Example 2.
(b) Preparation of
4,4'-bis(hydroxymethyl)-4''-nonadecyl-2,2':6',2''-terpyridine
[0076] 8.2 g of sodium borohydride was added to a suspension of
4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine (6.4 g,
10.0 mmol) in 200 mL of absolute ethanol. The mixture was refluxed
for 3 h and cooled to room temperature, and then 200 mL of an
ammonium chloride saturated water solution was added to decompose
the excess borohydride. The ethanol was removed under vacuum and
the precipitated solid was dissolved in a minimal amount of water.
The resulting solution was extracted with ethyl acetate
(5.times.200 mL) and dried over sodium sulfate, and the solvent was
removed under vacuum. The desired solid was obtained in 79% yield
and was used without further purification. Anal.
C.sub.36H.sub.53N.sub.3O.sub.2: Calcd: C, 77.24; H, 9.54; N, 7.51;
Found: C, 77.10; H, 9.47; N, 7.49. MS (ESIMS): m/z: 559.4.
(c) Preparation of
4,4'-bis(bromomethyl)-4''-nonadecyl-2,2':6',2''-terpyridine
[0077]
4,4'-Bis(hydroxymethyl)-4''-nonadecyl-2,2':6',2''-terpyridine (2.35
g, 4.2 mmol) was dissolved in a mixture of 48% HBr (20 mL) and
concentrated sulfuric acid (6.7 mL). The resulting solution was
refluxed for 6 h and then allowed to cool to room temperature, and
40 mL of water was added. The pH was adjusted to neutral with NaOH
solution and the resulting precipitate was filtered, washed with
water (pH)) 7), and air-dried. The product was dissolved in
chloroform (40 mL) and filtered. The solution was dried over
magnesium sulfate and evaporated to dryness, yielding 2.45 g of
4,4'-bis(bromomethyl)-4''-nonadecyl-2,2':6',2''-terpyridine (85%
yield) as a white powder. Anal. C.sub.36H.sub.51Br.sub.2N.sub.3:
calcd C, 63.07; H, 7.50; N, 6.13; found C, 62.88; H, 7.45; N, 6.19.
MS (ESIMS): m/z: 685.2.
(d) Preparation of
4,4'-bis(diethylmethylphosphonate)-4''-nonadecyl-2,2':6',2''-terpyridine
[0078] A chloroform (10 mL) solution of
4,4'-Bis(bromomethyl)-4''-nonadecyl-2,2':6',2''-terpyridine (3.02
g, 4.4 mmol) and 15 mL of triethyl phosphite was refluxed for 3 h
under nitrogen. The excess phosphite was removed under high vacuum,
and then the crude product was purified by column chromatography on
silica gel (eluent ethyl acetate/methanol 80/20) yielding 2.82 g
(80%) of
4,4'-bis(diethylmethylphosphonate)-4''-nonadecyl-2,2':6',2''-terpyridine.
Anal. C.sub.44H.sub.71N.sub.3O.sub.6P.sub.2: calcd C, 66.06; H,
8.95; N, 5.25; found C, 65.67; H, 8.88; N, 5.45;. MS (ESIMS): m/z:
799.5.
Example 5
Preparation of
4'-ethoxycarbonyl-4,4''-bis(nonadecyl)-2,2':6',2''-terpyridine, a
Compound of the Formula (II5)
##STR00024##
[0079] (a) Preparation of 2,6-dibromo-4-carboxy-pyridine (1)
[0080] This compound was prepared by an analogous procedure to that
described in Example 2 (step g). Anal.
C.sub.6H.sub.3Br.sub.2NO.sub.2: Calcd: C, 25.65; H, 1.08; Br,
56.89; N, 4.99; O, 11.39. Found: C, 25.52; H, 1.14; Br, 56.77; N,
5.04; O, 11.25. (ESIMS): m/z: 280.9.
(b) Preparation of 2,6-dibromo-4-ethoxycarbonyl-pyridine (2)
[0081] This compound was prepared by an analogous procedure to that
described in Example 2 (step j). Anal.
C.sub.8H.sub.7Br.sub.2NO.sub.2: Calcd: C, 31.10; H, 2.28; Br,
51.73; N, 4.53; O, 10.36. Found: C, 31.22.H, 2.15Br, 51.81; N, 4.45
O, 10.31. (ESIMS): m/z: 308.9.
(c) Preparation of 2-tributyl(4-nonadecylpyridine-2-yl)stannane
(3)
[0082] This compound was prepared by an analogous procedure to that
described in Example 2 (step d).
(d) Preparation of
4'-ethoxycarbonyl-4,4''-bis(nonadecyl_)-2,2':6',2''-terpyridine
(4)
[0083] 2,6-Dibromo-4-ethoxycarbonyl-pyridine(2) (1 mol),
2-tributyl(4-nonadecylpyridine-2-yl)stannane (2 mol) and
(Ph.sub.3P).sub.4Pd (0.01 equiv) were heated under N.sub.2 in
toluene (50 mL) for 16 h. Upon cooling to room temperature aqueous
saturated NH.sub.4Cl solution (20 mL) was added. The mixture was
stirred for further 30 min and then filtered over Celite. The
precipitate was washed with CH.sub.2Cl.sub.2 (50 mL) and the
organic phase was separated. The aqueous phases was extracted with
toluene. The combined organic phases were dried (MgSO.sub.4) and
the solvent was removed. Concentrated HCl (30 mL) was added to the
residue, followed by extracting with CH.sub.2Cl.sub.2. The aqueous
phase was cautiously neutralized by solid NaOH. The product was
then extracted with CH.sub.2Cl.sub.2 and dried. The solvent was
removed and the product was purified by chromatography on silica
gel with CH2Cl2/hexane (1:2) as eluent. Yield: (25%). Anal.
C.sub.56H.sub.91N.sub.3O.sub.2: Calcd: C, 80.23; H, 10.94; N, 5.01;
O, 3.82. Found: C, 80.05, 10.99 N, 5.23; O, 3.71, MS (ESIMS): m/z:
837.7.
Example 6
Preparation of
4-nonadecyl-4'-hexadecyl-4''-ethoxycarbonyl-2,2':6',2''-terpyridine,
a Compound of the Formula (II6)
##STR00025##
[0084] (a) Preparation of 3-oxo-nonadecanoic acid ethyl ester
(1)
[0085] To a solution of sodium hydride (1.2 g, 50 mmol) in THF,
distilled ethyl acetoacetate (4.16 g, 32 mmol) was added dropwise.
The resulting mixture was stirred for 30 min at room temperature
and then cooled at -78.degree. C. A solution of n-butyllithium in
hexane (16.1 mL, 35.2 mmol) was added dropwise. After stirring for
an additional 1 h at 0.degree. C., 1-bromohexadecane (19.1 mmol) in
THF was added and the mixture was stirred for 12 h. Ethanol (15 mL)
was added slowly at room temperature. The resulting solution was
filtered through a Celite pad, concentrated in vacuum and purified
by chromatography on silica gel to give the 3-oxo-nonadecanoic acid
ethyl ester as a solid. Anal. C.sub.21H.sub.40O.sub.3: Calcd: C,
74.07; H, 11.84; O, 14.09. Found: C, 73.98; H, 11.59; O, 14.25. MS
(ESIMS): m/z: 340.3.
(b) Preparation of 3-cyano-2,6-dihydroxy-4-hexadecyl-pyridine
(2)
[0086] 3-Oxo-nonadecanoic acid ethyl ester (11.3 mmol),
cyanoacetamide (0.95 g, 11.3 mmol) and piperidine (0.95 g, 11.3
mmol) in MeOH (3 mL) were heated under reflux for 24 h. The solvent
was evaporated, and the residue was dissolved in hot water. The
product was precipitated by addition of concentrated HCl, filtered,
washed with ice water and CHCl.sub.3 and dried in vacuum to give
3-cyano-2,6-dihydroxy-4-hexadecyl-pyridine as a white powder.
Yield: 40%. Anal. C.sub.22H.sub.36N.sub.2O.sub.2: Calcd: C, 73.29;
H, 10.06; N, 7.77; O, 8.88. Found: C, 73.35; H, 10.12; N, 7.85; O,
8.97. MS (ESIMS): m/z: 360.3.
(c) Preparation of 2,6-dihydroxy-4-hexadecyl-pyridine (3)
[0087] This compound was prepared by an analogous procedure to that
described in Example 2 (step f). Anal. C21H37NO2: Calcd: C, 75.17;
H, 11.12; N, 4.17; O, 9.54. Found: C, 75.03; H, 11.09; N, 4.25; O,
9.38. MS (ESIMS): m/z: 335.3.
(d) Preparation of 2,6-dibromo-4-hexadecyl-pyridine (4)
[0088] This compound was prepared by an analogous procedure to that
described in Example 2 (step g). Anal. C.sub.21H.sub.35Br.sub.2N:
Calcd: C, 54.67; H, 7.65; Br, 34.64; N, 3.04. Found: C, 54.84; H,
7.61; Br, 34.52; N, 3.11. MS (ESIMS): m/z: 461.1.
(e) Preparation of 2-tributyl(4-nonadecylpyridine-2-yl)stannane
(5)
[0089] This compound was prepared by an analogous procedure to that
described in Example 2 (steps a-d).
(f) Preparation of 6-Bromo-4-hexadecyl-4'-nonadecyl-2,2'-bipyridine
(6)
[0090] This compound was prepared by an analogous procedure to that
described in Example 2 (step h). Anal. C.sub.45H.sub.77BrN.sub.2:
Calcd: C, 74.45; H, 10.69; Br, 11.01; N, 3.86. Found: C, 74.59; H,
10.84; Br, 11.13; N, 3.82. MS (ESIMS): m/z: 724.5.
(g) Preparation of
6-tributylstannyl-4-hexadecyl-4'-nonadecyl-2,2'-bipyridine (7)
[0091] This compound was prepared by an analogo us procedure to
that described in Example 2 (step e). Anal.
C.sub.57H.sub.104N.sub.2Sn: Calcd: C, 73.13; H, 11.20; N, 2.99; Sn,
12.68. Found: C, 73.22; H, 11.28; N, 3.01; Sn, 12.59. MS (ESIMS):
m/z: 936.7.
(h) Preparation of 2-bromo-4-carboxy-pyridine (8)
[0092] This compound was prepared by an analogous procedure to that
described in Example 2 (step i). Anal. C.sub.6H.sub.4BrNO.sub.2:
Calcd: C, 35.67; H, 2.00; Br, 39.56; N, 6.93; O, 15.84. Found: C,
35.75; H, 2.03; Br, 39.61; N, 6.90; O, 15.77. MS (ESIMS): m/z:
200.9.
(i) Preparation of 2-bromo-4-ethoxycarbonyl-pyridine (9)
[0093] This compound was prepared by an analogous procedure to that
described in Example 2 (step j). Anal. C.sub.8H.sub.8BrNO.sub.2:
Calcd: C, 41.77; H, 3.50; Br, 34.73; N, 6.09; O, 13.91. Found: C,
41.87; H, 3.45; Br, 34.82; N, 6.03; O, 14.01. MS (ESIMS): m/z:
229.0.
(j) Preparation of
4-(nonadecyl)-4'-(hexadecyl)-4''(ethoxycarbonyl)-2,2':6',2''-terpyridine
(10)
[0094] This compound was prepared by an analogous procedure to that
described in Example 2 (step k). Anal.
C.sub.53H.sub.85N.sub.3O.sub.2: Calcd: C, 79.94; H, 10.76; N, 5.28;
O, 4.02. Found: C, 79.89; H, 10.70; N, 5.31; O, 3.98. MS (ESIMS):
m/z: 795.7.
Example 7
Preparation of 2,6-bis-(aminomethyl)-pyridine (Formula IIIc)
(a) Preparation of 2,6-bis-(bromomethyl)-pyridine (Synthesis Ref.
J. Am. Chem. Soc. 1977, 99, 6392.)
(b) 2,6-bis-(aminomethyl)-pyridine
[0095] To a solution of hexamethylenetriamine (10.4 mmol) in
CHCl.sub.3 (50 mL) heated at reflux, a solution of
2,6-bis-(bromomethyl)-pyridine (4.97 mmol) in CHCl.sub.3 (50 mL)
was added dropwise, and the mixture was refluxed for further 3 h.
The mixture was allowed to cool to room temperature and to stand.
The solid deposited was filtered off, dried, and suspended in
H.sub.2O/EtOH/conc. HCl. The mixture was stirred at 70.degree. C.
until the solid had completely dissolved. The salt
(2,6-bis-(aminomethyl)-pyridine). HCl which was crystallized from
solution on standing overnight at room temperature was filtered off
and dried. Yield 70%. Anal. C.sub.7H.sub.11N.sub.3: Calcd: C,
61.29; H, 8.08; N, 30.63. Found: C, 61.45; H, 8.00; N, 30.44. MS
(ESIMS): m/z: 137.1.
Example 8
Preparation of 2-hydroxy-1,3-benzenedicarboxilic acid (Formula
IIId)
[0096] This compound was prepared from 2-methoxyisophthalic acid by
an analogous procedure to that described in reference Chem. Bar
1889, 12, 816. Anal. C.sub.8H.sub.6O.sub.5: Calcd: C, 52.76; H,
3.32; O, 43.92. Found: C, 52.45; H, 3.30; O, 43.52. MS (ESIMS):
m/z: 182.0.
Example 9
Complex 1a
Preparation of the Complex of the Formula RuLY.sup.1, Wherein L is
4,4'4''-tricarboxy-2,2':6',2''-terpyridine and Y.sup.1 is
diethylenetriamine (deta)
(a) Preparation of
Ru(4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3
[0097] Ethyl alcohol (50 ml) and RuCl.sub.3 (0.26 g) were reacted
under argon. After the mixture was stirred for 2 min, a solution of
the ligand 4,4'4''-Trimethoxycarbonyl-2,2':6',2''-terpyridine, 0.4
g, in 50 mL of dichloromethane, was then added. The reaction
mixture was refluxed for 2 h under argon. The solution was
concentrated to 20 mL, and the reaction mixture was cooled to room
temperature. The precipitated complex,
Ru(4,4'4''-Trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3, was
collected on a sintered glass crucible and was washed with ethanol.
(yield 85%) Anal. C.sub.21H.sub.17Cl.sub.3N.sub.3O.sub.6Ru: Calcd:
C, 41.03; H, 2.79; N, 6.83. Found: C, 41.30; H, 2.67; N, 6.76. MS
(ESIMS): m/z: 613.9.
(b) Preparation of
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(deta)
[0098] To a solution of the complex
Ru(4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3 (300
mg, 0.5 mmol) in DMF (100 mL) was added diethylenetriamine (2.0
mmol) and Et.sub.3N (0.5 mL). The reaction mixture was refluxed for
8 h. Then, 10 mL of Et.sub.3N was added, and the solution was
refluxed for further 24 h to hydrolyze the ester groups on the
terpyridine ligand. The reaction mixture was allowed to cool, and
the solvent was removed on a rotary evaporator. The resulting solid
was dissolved in 0.1 M aqueous NaOH and
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(deta) was
precipitated by the addition of 0.1 M HNO.sub.3. The resulting
precipitate was filtered and dried. The isolated solid was
recrystallized from methanol-diethyl ether, after which it was
further purified on a Sephadex LH20 column, using methanol as
eluent (yield 75%). Anal. C.sub.22H.sub.24Cl.sub.2N.sub.6O.sub.6Ru:
Calcd: C, 41.26; H, 3.78; N, 13.12. Found: C, 41.04; H, 3.73; N,
13.03. MS (ESIMS): m/z: 640.02.
Example 10
Complex 2a
Preparation of the Complex of the Formula RuLY.sup.1(TBA).sub.2,
Wherein L is 4,4'4''-tricarboxy-2,2':6',2''-terpyridine, Y.sup.1 is
2,6-pyridinedimethanol (pdm) and TBA is tetrabutylammonium ion
(a) Preparation of
Ru(4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3
[0099] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(pdm)
[0100] This compound was prepared by an analogous procedure to that
described in Example 9 (step b). Anal.
C.sub.25H.sub.18N.sub.4O.sub.8Ru: Calcd: C, 49.75; H, 3.01; N,
9.28. Found: C, 49.75; H, 3.01; N, 9.28. MS (ESIMS): m/z:
604.02.
(c) Preparation of
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(pdm)(TBA).sub.2
[0101] Powder Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(pdm)
was dissolved in 0.1 M aqueous tetrabutylammonium hydroxide (TBAOH)
and the mixture heated to 110.degree. C., for 4 h (the pH of the
solution was about 11). The resulting purple solution was filtered
to remove a small amount of insoluble material and the pH was
adjusted to 5.0 with dilute hydrochloric acid. A dense precipitate
formed immediately but the suspension was nevertheless refrigerated
overnight prior to filtration to collect the product. After
allowing to cool to (25.degree. C.) room temperature, it was
filtered through a sintered glass crucible and dried under vacuum.
Anal. C.sub.57H.sub.88N.sub.6O.sub.8Ru: Calcd: C, 63.02; H, 8.16;
N, 7.7. Found: C, 63.02; H, 8.16; N, 7.7. MS (ESIMS): m/z:
1086.57.
Example 11
Complex 1b
Preparation of the Complex of the Formula RuLY.sup.1, Wherein L is
4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine and Y.sup.1 is
diethylenetriamine (deta)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0102] This compound was prepared by an analogous procedure to that
described in Example 9 (step a). Anal.
C.sub.39H.sub.53Cl.sub.3N.sub.3O.sub.6Ru: Calcd: C, 54.01; H, 6.16;
N, 4.85. Found: C, 53.80; H, 6.13; N, 4.77. MS (ESIMS): m/z:
866.20.
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(deta)
[0103] This compound was prepared by an analogous procedure to that
described in Example 9 (step b). Anal.
C.sub.41H.sub.62N.sub.6O.sub.6Ru: Calcd: C, 58.90; H, 7.47; N,
10.05. Found: C, 58.90; H, 7.47; N, 10.05. MS (ESIMS): m/z:
836.38.
Example 12
Complex 2b
Preparation of the Complex of the Formula RuLY.sup.1(TBA), Wherein
L is 4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine and
Y.sup.1 is 2,6-pyridinedimethanol (pdm) and TBA is
tetrabutylammonium ion
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0104] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(pdm)
[0105] This compound was prepared by an analogous procedure to that
described in Example 9 (step b). Anal.
C.sub.44H.sub.56N.sub.4O.sub.8Ru: Calcd: C, 58.90; H, 7.47; N,
10.05. Found: C, 58.90; H, 7.47; N, 10.05. MS (ESIMS): m/z:
870.31.
(c) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(pdm)(TBA)
[0106] This compound was prepared by an analogous procedure to that
described in Example 10 (step c). Anal.
C.sub.60H.sub.91N.sub.5O.sub.8Ru: Calcd: C, 64.84; H, 8.25; N,
6.30. Found: C, 64.84; H, 8.25; N, 6.30. MS (ESIMS): m/z:
1111.59.
Example 13
Complex 3a
Preparation of the Complex of the Formula RuLY.sup.1, Wherein L is
4,4'4''-tricarboxy-2,2':6',2''-terpyridine and Y.sup.1 is
2,6-bis-(aminomethyl)-pyridine (bamp)
(a) Preparation of
Ru(4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3
[0107] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(bamp)
[0108] This compound was prepared by an analogous procedure to that
described in Example 9 (step b). Anal.
C.sub.25H.sub.22N.sub.6O.sub.6Ru: Calcd: C, 49.75; H, 3.67; N,
13.92. Found: C, 49.23; H, 3.61; N, 13.88. MS (ESIMS): m/z:
604.06.
Example 14
Complex 3c
Preparation of the Complex of the Formula RuLY.sup.1, Wherein
L.sup.1 is 4,4'-Dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine and
Y.sup.1 is 2,6-Bis-(aminomethyl)-pyridine (bamp)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0109] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(bamp)
[0110] This compound was prepared by an analogous procedure to that
described in Example 9 (step b). Anal.
C.sub.44H.sub.60N.sub.6O.sub.6Ru: Calcd: C, 60.74; H, 6.95; N,
9.66. Found: C, 60.74; H, 6.95; N, 9.66. MS (ESIMS): m/z:
870.36.
Example 15
Complex 4a
Preparation of the Complex of the Formula RuLY.sup.1(TBA).sub.3,
Wherein L is 4,4'4''-tricarboxy-2,2':6',2''-terpyridine, Y.sup.1 is
2-hydroxy-1,3-benzenedicarboxilic acid (hbdc) and TBA is
tetrabutylammonium ion
(a) Preparation of
Ru(4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3
[0111] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(hbdc)
[0112] This compound was prepared by an analogous procedure to that
described in Example 9 (step b). Anal.
C.sub.26H.sub.14N.sub.3O.sub.11Ru: Calcd: C, 48.38; H, 2.19; N,
6.51; Found: C, 48.05; H, 2.11; N, 6.61. MS (ESIMS): m/z:
645.97.
(c) Preparation of
Ru(4,4'4''-tricarboxy-2,2':6',2''-terpyridine)(hbdc)(TBA).sub.3
[0113] This compound was prepared by an analogous procedure to that
described in Example 10 (step c). Anal.
C.sub.75H.sub.124N.sub.6O.sub.11Ru: Calcd: C, 64.95; H, 9.01; N,
6.06. Found: C, 64.34; H, 9.12; N, 6.00. MS (ESIMS): m/z:
1386.84.
Example 16
Complex 5a
Preparation of the Complex of the Formula
RuL(NCS).sub.3(TBA).sub.2, Wherein L is
4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine (Formula 2)
and TBA is tetrabutylammonium ion
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0114] This compound was prepared by an analogous procedure to that
described in Example 9 (step a). Anal.
C.sub.40H.sub.57Cl.sub.3N.sub.3O.sub.4Ru: Calcd: C, 56.43; H, 6.75;
N, 4.94. Found: C, 56.12; H, 6.65; N, 4.87. MS (ESIMS): m/z:
850.25.
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(NCS).sub.3
[0115] The complex
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)(NCS).sub.-
3 was synthesized in dark under an argon atmosphere by refluxing at
130.degree. C., a solution of NH.sub.4NCS (2 g, in 10 mL of
H.sub.2O) and
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
complex (0.5 g, in 50 mL of DMF) for 4 h. Then, 20 mL of
triethylamine and 10 mL of H.sub.2O were added, and the solution
was refluxed for a further 24 h to hydrolyze the ester groups on
the terpyridine ligand. The solvent volume was reduced on a rotary
evaporator to about 10 mL, and than the solution was added to 70 mL
of H.sub.2O. The resulting precipitate was filtered and dried. The
isolated solid was recrystallized from methanol-diethyl ether,
after which it was further purified on a Sephadex LH20 column,
using methanol as eluent (yield 75%). Anal.
C.sub.39H.sub.49N.sub.6O.sub.4RuS.sub.3: Calcd: C, 54.27; H, 5.72;
N, 9.74. Found: C, 53.78; H, 5.52; N, 9.64. MS (ESIMS): m/z:
863.20.
(c) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(NCS).sub.3(TBA).-
sub.2
[0116] This compound was prepared by an analogous procedure to that
described in Example 10 (step c). Anal.
C.sub.71H.sub.120N.sub.8O.sub.4RuS.sub.3: Calcd: C, 63.31; H, 8.98;
N, 8.32. Found: C, 63.31; H, 8.98; N, 8.32. MS (ESIMS): m/z:
1346.76.
Example 17
Complex 6a
Preparation of the Complex of the Formula RuLY.sup.2(NCS)(TBA),
wherein L is 4,4'-Dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine
(Formula 2) and Y.sup.2 is
1,1,1-trifluoropentane-2,4-dionato(tfac)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0117] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(tfac)(NCS)
[0118] To a solution of the complex
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
(300 mg, 0.5 mmol) in methanol (100 mL) was added tfac (236 .mu.L,
2.0 mmol) and Et.sub.3N (0.5 mL). The reaction mixture was refluxed
for 8 h and the solvent was then allowed to evaporate on a rotary
evaporator. The solid mass thus obtained was dissolved in 30 mL of
DMF under nitrogen. To this solution was added 5 mL of an aqueous
solution of NaSCN (300 mg, 3.7 mmol). After being refluxed for 8 h,
10 mL of Et.sub.3N was added, and the solution was refluxed for
further 24 h to hydrolyze the ester groups on the terpyridine
ligand. The reaction mixture was allowed to cool, and the solvent
was removed on a rotary evaporator. The resulting solid was
dissolved in 0.1 M aqueous NaOH and
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(tfac)(NCS)
was precipitated by the addition of 0.1 M HNO.sub.3. The resulting
precipitate was filtered and dried. The isolated solid was
recrystallized from methanol-diethyl ether, after which it was
further purified on a Sephadex LH20 column, using methanol as
eluent (yield 75%).
(c) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(tfac)(NCS)(TBA)
[0119] This compound was prepared by an analogous procedure to that
described in Example 10 (step c).
Example 18
Complex 7b
Preparation of the Complex of the Formula RuLY.sup.3(NCS)(TBA),
Wherein L is 4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine
(Formula 1) and Y.sup.3 is
4,4,4-trifluoro-1-(4-fluorophenyl)butane-1,3-dione(F-phtfac)
(a) Preparation of
Ru(4,4'4''-trimethoxycarbonyl-2,2':6',2''-terpyridine)Cl.sub.3
[0120] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(F-phtfac)(NCS)
[0121] This compound was prepared by an analogous procedure to that
described in Example 17 (step b).
(c) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(F-phtfac)(NCS)(T-
BA)
[0122] This compound was prepared by an analogous procedure to that
described in Example 10 (step c).
Example 19
Complex 8a
Preparation of the Complex of the Formula RuLY.sup.4(NCS), Wherein
L is 4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine (Formula
2) and Y.sup.4 is 2,2'-bipyridine (bpy)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0123] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(bpy)(NCS)
[0124] This compound was prepared by an analogous procedure to that
described in Example 17 (step b).
Example 20
Complex 9a
Preparation of the Complex of the Formula
RuLY.sup.4(NCS)(TBA).sub.2, Wherein L is
4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine (Formula 2)
and Y.sup.4 is quinoxaline-2,3-dithiolate (qdt)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0125] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(qdt)(NCS)
[0126] This compound was prepared by an analogous procedure to that
described in Example 17 (step b).
(c) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(qdt)(NCS)(TBA).s-
ub.2
[0127] This compound was prepared by an analogous procedure to that
described in Example 10 (step c).
Example 21
Complex 10a
Preparation of the Complex of the Formula
RuLY.sup.4(NCS)(TBA).sub.2, Wherein L is
4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine (Formula 2)
and Y.sup.4 is oxalic acid (ox)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0128] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(ox)(NCS)
[0129] This compound was prepared by an analogous procedure to that
described in Example 17 (step b).
(c) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(ox)(NCS)(TBA).su-
b.2
[0130] This compound was prepared by an analogous procedure to that
described in Example 10 (step c).
Example 22
Complex 11a
Preparation of the Complex of Formula RuLY.sup.4(NCS), Wherein L is
4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine (Formula 2)
and Y.sup.4 is ethylenediamine(en)
(a) Preparation of
Ru(4,4'-diethoxycarbonyl-4''-nonadecyl-2,2':6',2''-terpyridine)Cl.sub.3
[0131] This compound was prepared by an analogous procedure to that
described in Example 9 (step a).
(b) Preparation of
Ru(4,4'-dicarboxy-4''-nonadecyl-2,2':6',2''-terpyridine)(en)(NCS)
[0132] This compound was prepared by an analogous procedure to that
described in Example 17 (step b).
Preparation of Sensitized Semiconductor Electrode:
[0133] Nanocrystalline TiO.sub.2 films of about 20 .mu.m were
prepared by spreading a viscous dispersion of colloidal TiO.sub.2
particles (Sloaronix) on a conducting glass support (Asahi TCO
glass, fluorine-doped SnO.sub.2 overlayer, transmission >85% in
the visible, sheet registance 7-8 ohms/square) with heating under
air for 30 min at 500.degree. C. The performance of the film as a
sensitized photoanode was improved by further deposition of
TiO.sub.2 from aqueous TiCl.sub.4 solution. A freshly prepared
aqueous 0.2 M TiCl.sub.4 solution applied onto the electrode. After
being left for 20 min at 70.degree. C. in a closed chamber, the
electrode was washed with distilled water. Immediately before being
dipped into the dye solution, it was fired again for 30 min at
500.degree. C. in air. After cooling under a continuous argon flow
the glass sheet is immediately transferred to a 2.times.10.sup.-4 M
solution in 1:1 acetonitrile:n-butanol of the tetrabutylammonium
salt of ruthenium complex of 7b (example 18), this solution further
containing 40 mM of deoxycholic acid as a co-adsorbent. The
adsorption of photosensitizer from the dye solution is allowed to
continue for 15 hours after that the glass sheet is withdrawn and
washed briefly with absolute ethanol. The TiO.sub.2 layer on the
sheet assumed a black color owing to the photosensitive
coating.
Preparation of Solar Cell:
[0134] A solar cell (size: 0.25 cm.sup.2) was fabricated using the
above electrode and a counter electrode, which was a platinum
electrode, obtained by vacuum-deposition of platinum on a
conductive glass. The platinum layer had a thickness of 20 nm. An
electrolyte solution to be placed between the two electrodes was a
redox pair of I--/I.sub.3-- obtained using 0.5 M
4-tert-butylpyridine, 0.1 M LiI, 0.6M 1,2-dimethyl-3-propyl
imidazolium iodide and 0.1 M I.sub.2 as solutes and a liquid of
acetonitrile.
Operation of Solar Cell:
[0135] A potentiostat was used for measuring short-circuit electric
current, open circuit voltage and fill factor. Experiments are
carried out with a high pressure Xenon lamp equipped with
appropriate filters to simulate AM 1.5 solar radiation. The
intensity of the light is 100 mW/cm.sup.2. The fill factor defined
as the maximum electric power output of the cell divided by the
product of open circuit voltage and short circuit current.
[0136] It was found that the thus constructed solar cell using
sensitizer 7b gave a short-circuit electric current of 20
mA/cm.sup.2, an open circuit voltage of 0.70 V and a fill factor FF
of 0.73 under irradiation of AM 1.5 using solar simulator light
(100 mW/cm.sup.2).
* * * * *