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Charge transfer complexing in the course of triplet state quenching of carbocyanine dyes by nitroxyl radical

✍ Scribed by V.A. Kuzmin; A.S. Tatikolov; Yu.E. Borisevich

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
359 KB
Volume
53
Category
Article
ISSN
0009-2614

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✦ Synopsis

Quenching of triplet states of carbocyanine dyes by nitroxyl radical has been investigated by the f&b pliotolysis method. Quenching of triplet state carbocyanine dyes with one po~yme#yne chain occurs via enhanced intersystem crossing on exchanse interaction with the radicaf, Quencbiog of tri&t state carbocyanine dyes with two polymetbyne chains occurs via partial charge transfer in the collision complex with the radical. In the second case, an increase in the dielectric constant of the solvent leads to an increase of the rate of quenching. In high polarity solvents (propanol, methanol) complete electron transfer from dye triplet state to radical occurs. Kinetic and spectral characteristics of a new dye radical (Dye?) are reported.

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