Efficiency of singlet oxygen generation by alloxazines and isoalloxazines

Abstract

Some spectroscopic properties of alloxazines and the lifetimes of their singlet and triplet states in acetonitrile are reported. In addition, the efficiencies of singlet oxygen production by energy transfer from the excited states of a range of substituted alloxazines and lumiflavine have been determined in aerated acetonitrile solution. Triplet state quantum yields have also been measured and it has been shown that the efficiency of singlet oxygen production from the triplet state is equal to unity within experimental error in all cases.