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Structure-dependent switchover of reaction modes: A laser flash photolysis and magnetic field effect study

Paper ID Volume ID Publish Year Pages File Format Full-Text
28340 44071 2007 5 PDF Available
Title
Structure-dependent switchover of reaction modes: A laser flash photolysis and magnetic field effect study
Abstract

This work illustrates a switchover of reaction mode on account of steric effect in different types of media. We have observed that in polar organic medium, 2-methyl-1,4-naphthoquinone (menadione, MQ) undergoes electron transfer (ET) with different amines, e.g., triethylamine (TEA), N,N-dimethylaniline (DMA) and 4,4′-bis(dimethylamino)diphenylmethane (DMDPM), whereas in SDS micelles it abstracts hydrogen from DMA and DMDPM although ET persists with TEA. On the contrary, our previous reports indicate that the mode of interaction of 9,10-anthraquinone with DMA and DMDPM is predominantly ET in both these media. Here we have attempted to explain such anomalous behavior.

Keywords
ET, electron transfer; MQ, 2-methyl-1,4-naphthoquinone or menadione; TEA, triethylamine; DMA, N,N-dimethylaniline; DMDPM, 4,4′-bis(dimethylamino)diphenylmethane; MeCN, acetonitrile; SDS, sodium dodecyl sulphate; H, hydrogen; AQ, 9,10-anthraquinone; MF, ma
First Page Preview
Structure-dependent switchover of reaction modes: A laser flash photolysis and magnetic field effect study
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 186, Issues 2–3, 25 February 2007, Pages 130–134
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering