Abstract
N-Methoxy-1-(1-pyrenyl)methanimine ( VII) undergoes mutual isomerization between the Z and E isomers around the CN double bond on triplet sensitization. The quantum yields of Z → E isomerization increase linearly with the initial Z isomer concentration exceeding unity. Furthermore, a considerably long-lived triplet state assigned to the E triplet is observed on laser photolysis. On the basis of these experimental findings, the mechanism of isomerization of VII, proceeding by a dual two-way and one-way mode, is discussed.
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