Tetrahedron p. 7335 - 7344 (1988)
Update date:2022-08-11
Topics:
Haselbach, Edwin
Vauthey, Eric
Suppan, Paul
Photoinduced electron transfer reactions in acetonitrile with benzophenone, anthraquinone, 9-cyanoanthracene and 9,10-dicyanoanthracene as electron acceptors, and with 1,4-diazabicyclo<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 (cyanoantracenes/donors).In the triplet systems, geminate back electron transfer is limited by the rate of spin flip.
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