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Indexed by:期刊论文

Date of Publication:2004-05-01

Journal:DYES AND PIGMENTS

Included Journals:Scopus、SCIE、EI

Volume:61

Issue:2

Page Number:103-107

ISSN No.:0143-7208

Key Words:near-infrared dyes; cyanine dyes; fluorescent dyes; SiO2 sol-gel

Abstract:Near-infrared dyes are becoming more and more important in modern technologies. To improve the stability and spectral properties, new heptamethine 3H-indocyanine dyes were synthesized and tested in solvents and SiO2 sol-gel. The results show that the dyes containing cyclohexenylene bridge and N-(4-carboxy) benzyl groups have better photostability and longer absorption wavelength than those containing linear heptamethine bridge and/or N-(5-carboxy)pentanyl groups. The absorption maxima are in reverse proportion to the polarity of the solvents. When dyes doped in SiO2 sol-gel, the absorption maxima are between their relative ones in methanol and in DMF. (C) 2003 Elsevier Ltd. All rights reserved.