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Comparison of Photoinduced Electron-Transfer Reactions of Aromatic Carbonyl vs. Cyano-Compounds with Electron Donors in Condensed Phase: the Importance of the Spin State of the Geminate Ion Pair for Obtaining High Ion Yield

Authors
Haselbach, Edwin
Suppan, Paul
Published in Tetrahedron. 1988, vol. 44, no. 24, p. 7335-7344
Abstract Photoinduced electron transfer reactions in acetonitrile with bensopheneone, anthraquinone, 9-cyanoanthracene and 9,10-dicyanoanthracene as electron acceptors, and with 1,4-diasabicyclo[2,2,2]octane and N,N-dimethylaniline as electron donors have been studied with ns-laser flash photolysis and fluorescence quenching measurements. For these systems the resulting free ion yield depends on the spin state of the geminate ion pair: its separation is very efficient if formed in a triplet state (carbonyl compounds/donors), while it is very inefficient if formed in a singlet state (cyanoanthracenes/donors). In the triplet systems, geminate back electron transfer is limited by the rate of spin flip.
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Research group Groupe Vauthey
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HASELBACH, Edwin, VAUTHEY, Eric, SUPPAN, Paul. Comparison of Photoinduced Electron-Transfer Reactions of Aromatic Carbonyl vs. Cyano-Compounds with Electron Donors in Condensed Phase: the Importance of the Spin State of the Geminate Ion Pair for Obtaining High Ion Yield. In: Tetrahedron, 1988, vol. 44, n° 24, p. 7335-7344. https://archive-ouverte.unige.ch/unige:3074

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Deposited on : 2009-09-21

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