Structure and solvent effect on the photostability of indolenine cyanine dyes

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• 作者：Chen ; Ping ; Sun ; Shuqing ; Hu ; Yunfeng ; Qian ; Zhiguo ; Zheng ; Deshui
• 关键词：Solvent effect ; Photostability ; Cyanine dyes ; Structure effect ; Photooxidation
• 刊名：Dyes and Pigments
• 出版年：1999
• 期刊代码：31_01437208
• 类别：ms
• 出版时间：March, 1999
• 卷：41
• 期：3
• 页码：227-231
• 文件大小：149 K

摘要

The structure and solvent effect on the photostability of a series of indolenine cyanine dyes have been investigated. It was found that the photostability did not increase with the increase of the central conjugated chain length and/or substituent groups on the heterocyclic ring. Using UV spectra data, we have found that the photostability of indolenine cyanine dyes in solution increased with increase of the E_T(30) values of solvents. The rate of singlet oxygen formation, and β values in different solvents sensitized by the dye alone were measured using fluorescence spectra. Absolute photooxidation rate constants (k_r) are calculated, based on the determined β values and the decay rate of singlet oxygen (k_d). All these results well agreed with those obtained from UV spectra.