Chemical evidence of a triplet mechanism in the photoisomerization of nitrostibenes. Formation of singlet oxygen from triplet states of nitrostilbenes

Abstract
In the presence of oxygen several photoexcited (λ > 300 nm)trans-4-nitrostilbenes give rise to the formation of singlet excited oxygen whereas trans-stilbenes substituted other groups as well as unsubstituted trans-stilbene do not.

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