Synthesis and Characterizations of a Porphyrin Dimer Having a 2,6-diacylpyridyl Group as a Spacer between Two Porphyrin Units

Abstract

The synthesis of a porphyrin dimer with a 2,6-diacylpyridyl group as a recognition site was accomplished by the coupling of 2,6-diaminopyridine and two porphyrins with a 4’-ethoxycarbonylbiphenyl substitutent at a meso -position of the porphyrin ring. By comparing the absorption spectrum of the obtained porphyrin dimer in CH₂Cl₂ with that of the corresponding porphyrin monomer, no remarkable interaction between two zinc porphyrin units was indicated. ¹H NMR studies revealed that hydrogen bonding interactions of the 2,6-diacylpyridyl group in the porphyrin dimer serve to form a novel supramolecular assembly in the presence of naphthalenediimide compound.