Mesoporphyrin-II has been bridged by several 2,2′-hydroxymethyl-substituted 4,4′-bipyridine compounds. N-Methylation of the bipyridine bridge groups yielded viologen-bridged porphyrins which have unusual aggregation and fluorescence properties. An improved route to quinone-bridged porphyrins is also reported.
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Leighton et al. (1987) studied this question.