Synthesis of bipyridyl-, viologen-, and quinone-bridged porphyrins
Abstract
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.