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THE INFLUENCE OF COUNTERION ON PHOTOCHEMISTRY OF CATIONIC INDOPOLYCARBOCYANINE DYES IN ION-PAIRS

被引：32
作者：
TATIKOLOV, AS
SHVEDOVA, LA
DEREVYANKO, NA
ISHCHENKO, AA
KUZMIN, VA
机构：
[1] Institute of Chemical Physics, Academy of Sciences, the USSR, 117977 Moscow, Kosygin Street 4
来源：
CHEMICAL PHYSICS LETTERS | 1992年 / 190卷 / 3-4期
关键词：
D O I：
10.1016/0009-2614(92)85341-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
It has been shown that the rate constant of cis-trans isomerization of cyanine dyes studied decreases significantly with changing the solvent from a polar to a nonpolar one at the expense of ion pair formation (dye cation with anion in nonpolar solvent). This phenomenon is accounted for by an increase in the bond order about which the rotation occurs during isomerization. It is observed that ion pair formation has practically no influence on the triplet state lifetime: a sharp increase in the decay rate of dyes III and VIII triplet state results from the heavy atom effect (I- anion).
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页码：291 / 297
页数：7
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