Abstract
Abstract 1,1′-Dibenzyl-4,4′-bipyridinium (viologen) coupled with 5,10,15,20-tetraphenylporphyrin or its metal complex via a carbonyloxy spacer was prepared by modification of 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin. The viologens in polar aprotic media brought about increases in the visible absorption characateristic of, but different in stability from, those of the conventional viologen radical cations upon irradiation with visible light (photochromism).
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