The radicals formed by photoinduced electron transfer from hypocrellins to electron acceptors

The radicals formed by photoinduced electron transfer from hypocrellins to electron acceptors The photoinduced electron transfer from excited singlet and triplet states of hypocrellins to three electron acceptors, namely, methyl viologen chloride (MV), tetrachloro-p-benzoquinone (TCQ) and 2,3-dichloro-5,6-dicyan-p-benzoquinone (DDQ), has been investigated by fluorescence and time-resolved transient absorption spectra. In acetonitrile solution, DDQ and TCQ quenched the fluorescence and T-T absorption of hypocrellins (HA and HB) efficiently, while neither fluorescence nor T-T absorption of them could be quenched by MV. The quenching resulted from the electron transfer between excited hypocrellins and the electron acceptors was controlled by diffusion. The rate constants of electron transfer from excited singlet and triplet of HA to DDQ are 9.20×1010 dm3 mol−1 s−1 and 1.28×109 dm3 mol−1 s−1, respectively. The transient absorption spectra of the formed radical cations of hypocrellins are reported. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

The radicals formed by photoinduced electron transfer from hypocrellins to electron acceptors

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Publisher
Springer Journals
Copyright
Copyright © 2000 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856700X00679
Publisher site
See Article on Publisher Site

Abstract

The photoinduced electron transfer from excited singlet and triplet states of hypocrellins to three electron acceptors, namely, methyl viologen chloride (MV), tetrachloro-p-benzoquinone (TCQ) and 2,3-dichloro-5,6-dicyan-p-benzoquinone (DDQ), has been investigated by fluorescence and time-resolved transient absorption spectra. In acetonitrile solution, DDQ and TCQ quenched the fluorescence and T-T absorption of hypocrellins (HA and HB) efficiently, while neither fluorescence nor T-T absorption of them could be quenched by MV. The quenching resulted from the electron transfer between excited hypocrellins and the electron acceptors was controlled by diffusion. The rate constants of electron transfer from excited singlet and triplet of HA to DDQ are 9.20×1010 dm3 mol−1 s−1 and 1.28×109 dm3 mol−1 s−1, respectively. The transient absorption spectra of the formed radical cations of hypocrellins are reported.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jul 7, 2009

References

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