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Photoinduced electron transfer reactions of pyrylium derivatives with organic sulfides in acetonitrile

Paper ID Volume ID Publish Year Pages File Format Full-Text
28961 44109 2009 8 PDF Available
Title
Photoinduced electron transfer reactions of pyrylium derivatives with organic sulfides in acetonitrile
Abstract

The photochemistry and photophysics of pyrylium derivatives with organic sulfides in acetonitrile medium are investigated. A steady decrease in the fluorescence intensity and fluorescence lifetime of the dyes was observed with increase in the quencher concentration. Bimolecular quenching constants were evaluated and correlated with the free energy of electron transfer. Laser flash photolysis investigations on the dyes in presence of quenchers were done. Observation of pyranyl radical and sulfide cation radicals as intermediates clearly illustrates the electron transfer mechanistic pathway for this reaction. The radical pair energies were calculated and found to be lower than the triplet energy of the sensitisers and hence we do not see any triplet induction in the present system.

Keywords
Sensitiser; Fluorescence quenching; Electron transfer; Pyranyl radical
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Photoinduced electron transfer reactions of pyrylium derivatives with organic sulfides in acetonitrile
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 201, Issues 2–3, 25 January 2009, Pages 175–182
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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