A Striking Effect of Spin Multiplicity on the Photoinduced Electron-Transfer Reaction of a 1-Vinylnaphthalene – Pyromellitic Dianhydride System

Abstract
The photochemical reaction of a 1-vinylnaphthalene – pyromellitic dianhydride system is found to show a striking effect of spin multiplicity on the reaction pathway; whereas the radical ion pair generated in the electronically excited singlet state readily undergoes back electron transfer, that produced in the triplet state leads to the formation of a 2 : 1 adduct. The present study presents an example which suggests the control of back electron transfer by spin multiplicity in the photoinduced electron-transfer reaction.

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