Abstract
The synthesis and characterization of seven (ZnII)2bis(porphyrin) molecules are described. The molecular structures of two bis(porphyrin)s (6 and 7) were determined by X-ray diffraction methods. Four of the compounds have their porphyrin moieties attached in a meta-fashion to a substituted benzene ring (1−4), two have porphyrin rings attached in a gem-fashion to a carbon−carbon double bond (6 and 7), and one bis(porphyrin) (5) has a p-phenylene coupler. Bis(porphyrin)s 1, 4, and 5 contain tetraaryl-type porphyrins, while 2, 3, 6, and 7 contain triarylethynylporphyrins. Except for exciton coupling in the unoxidized species, interaction between porphyrins is greater in the triarylethynyl-type bis(porphyrin)s than in the tetraaryl-type bis(porphyrin)s regardless of the number of bonds through which the interaction propagates. The cyclic voltammetry of the bis(porphyrin)s was examined, and a varying degree of interaction between electrophores within the series was found. Redox splitting was observed for porph...
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