Abstract

The technique of energy transfer has been used in an attempt to establish the photoreactive state of acridine in solution. It is shown that the lowest-lying triplet of acridine, the ππ* triplet, is not the reactive species and that the reaction originates, at least in part, through the nπ* triplet. In the course of this work, the transfer of triplet-state energy from biacetyl to acridine, phenazine, anthracene, 1,2-benzanthracene, pyrene, 1,2-benzpyrene and 3,4-benzpyrene has been studied by an intensity method.

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