Citation: Li Qiu WANG, Xiao Jun PENG, Wei Bing ZHANG, Fei YIN, Jing Nan CUI, Xin Qin GAO. Synthesis and Spectral Properties of Novel Water-soluble Near-infrared Fluorescent Indocyanines[J]. Chinese Chemical Letters, ;2005, 16(3): 341-344. shu

Synthesis and Spectral Properties of Novel Water-soluble Near-infrared Fluorescent Indocyanines

1.
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012;
2.
Yanshan University, Qinhuangdao 066004;
3.
Chinese Academy of Science Dalian Institute of Chemical Physics, Dalian 116023

Received Date: 9 February 2004

Fund Project: The authors would like to thank the National Natural Science Foundation of China and The Ministry of Education of China for providing the financial support for this project, and also thank Professor Licheng Sun (Stockholm University, Sweden) for affording the nanostructured TiO₂ film electrode.

Two fluorescent pentamethine and a squarylium indocyanines containing at least one p-carboxybenzyl group on N atoms in the heterocyclic rings were synthesized. They had good water solubility and photostability. Their maximum absorption and maximum emission were 600-700 nm in water. When it was anchored onto nanostructured TiO₂ electrode, compared with in water, the squaraine showed double absorption peaks (one blue shifted and another red shifted)and absorption intensity of the red shift peak increased with the increase of the time of irradiation.The intensity of the blue one decreased simultaneously. We proposed that the presence of two electronic charge forms of squaraine anchored on the TiO₂ film might be the reason.
- Indocyanine,
- p-carboxybenzyl,
- near-infrared,
- fluorescence,
- bioanalysis,
- solar cell.
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