A tr esr study of the reactions of excited organic triplet molecules with inorganic sulfur oxoanions

A tr esr study of the reactions of excited organic triplet molecules with inorganic sulfur oxoanions The reactions of excited triplet ketones including benzophenone, 4,4′-dihydroxybenzophenone, and acetone with inorganic sulfur oxoanions: sulfite (SO3 =), metabisulfite (S2O5 =), and dithionite (S2O4 =) in solution were studied by TRESR. Observation of radical anion intermediates polarized by the Triplet Mechanism demonstrated the reactions of electron transfer from the sulfur dianions to the organic triplet states. Thus, electron transfer from SO3 = to the triplet organic carbonyl compounds gave rise to the SO3 − radical; reactions with metabisulfite and dithionite were more complex and may be interpreted as occurring via electron transfer to the carbonyl system followed by dissociation of the S-S bond in the resulting sulfur oxoanion radical. The initial radical ion pairs thus formed consist of pairs of anion radicals, one organic and one inorganic. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

A tr esr study of the reactions of excited organic triplet molecules with inorganic sulfur oxoanions

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Publisher
Springer Netherlands
Copyright
Copyright © 1997 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856797X00114
Publisher site
See Article on Publisher Site

Abstract

The reactions of excited triplet ketones including benzophenone, 4,4′-dihydroxybenzophenone, and acetone with inorganic sulfur oxoanions: sulfite (SO3 =), metabisulfite (S2O5 =), and dithionite (S2O4 =) in solution were studied by TRESR. Observation of radical anion intermediates polarized by the Triplet Mechanism demonstrated the reactions of electron transfer from the sulfur dianions to the organic triplet states. Thus, electron transfer from SO3 = to the triplet organic carbonyl compounds gave rise to the SO3 − radical; reactions with metabisulfite and dithionite were more complex and may be interpreted as occurring via electron transfer to the carbonyl system followed by dissociation of the S-S bond in the resulting sulfur oxoanion radical. The initial radical ion pairs thus formed consist of pairs of anion radicals, one organic and one inorganic.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Apr 14, 2009

References

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