Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2004-05-01

Journal: DYES AND PIGMENTS

Included Journals: EI、SCIE、Scopus

Volume: 61

Issue: 2

Page Number: 103-107

ISSN: 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.