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W. Zhan et al. / Tetrahedron Letters 48 (2007) 2461–2465
Supplementary data
a 16
I
14
12
10
8
Supplementary data (experimental details, synthetic and
spectroscopic data) associated with this article can be
75 mW cm-2
References and notes
6
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20 mW cm-2
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2
0.0
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0.5
0.6
V/V
b
10
8
II
75 mWcm-2
6
4
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´
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0.0
0.1
0.2
0.3
0.4
0.5
V/V
Figure 4. Photocurrent–voltage curve of I (a) and II (b) sensitized TiO2
electrodes under different light intensities.
the limiting step in the current production, which
has a dramatic influence on the efficiency of I and II,
which decreases from 5.8% to 4.8%, 5.0% to 3.5%,
respectively.
In conclusion, two new cyanine dyes with carboxylic
acid group were synthesized via ‘Click’ reaction and
characterized by 1H NMR, 13C NMR and MS-ESI.
Through investigation of their absorption and photo-
electrochemical properties, I is found to be a better sen-
sitizer, which has a conversion yield of 4.8%, with a
short-circuit photocurrent of 14.5 mA cmꢀ2, an open-
circuit voltage of 0.5 V and a fill factor of 0.49 under
illumination of AM 1.5 (75 mA cmꢀ2). The optimal
measurement of their photovoltaic properties is in
progress.
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Acknowledgements
This work was supported by NSFC (60508011)/China
and Scientific Committee of Shanghai. The authors
thank Professor Fuyou Li at Fudan University for the
solar cells’ tests.