Siamese-Twin Porphyrins: Variation of Two meso-Aryl Groups

Abstract

Variation of two out of the six meso-aryl groups in Siamese-twin porphyrin, an expanded porphyrin incorporating two pyrazole moieties, identified a set of substituents that result in optimized preparation of highly crystalline products. Electron-donating and electron-withdrawing aryl substituents have only negligible electronic and structural influences on the free-base macrocycles (as measured by their UV/Vis absorption spectra and solid-state structures, respectively) and their dicopper complexes (as measured by their cyclic voltammograms).