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The Radicals Formed By Photoinduced Electron Transfer From Hypocrellins To Electron Acceptors

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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 x 1010 dm3 mol-1 s-1 and 1.28 x 109 dm3 mol-1 s-1, respectively. The transient absorption spectra of the formed radical cations of hypocrellins are reported.

Affiliations: 1: Centre for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. CHINA


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