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The photoinduced electron transfer properties of pyrylium salts 1a-d and the corresponding thiopyrylium derivatives 2a-d were investigated. Electron transfer from biphenyl (BP) and 4,4 -dimethoxystilbene to the singlet and triplet excited states of the salts led to efficient formation of the separated radical pairs. Using BP as donor, we have estimated the extinction coefficients and also the yields...
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