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Synthesis, Characterization and Electrochemistry of Succinyloxyl‐Bridged Metal‐Free and Transition Metal Porphyrin Dimers

Novel metal‐free and Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Mn(III) porphyrin dimers bridged by meso‐succinyloxyl were prepared in high yields. The new compounds were characterized by elemental analysis, 1H NMR, MS, IR and UV‐vis spectroscopy. Molar conductance data indicate that the monomeric complexes of Fe(III) and Mn(III) have 1∶1 electrolytic behavior; the dimeric complexes of Fe(III) and Mn(III) have 1∶2 electrolytic behavior, while the others show no electrolytic behavior. Meanwhile, the electrochemistry properties of the dimers were analyzed and compared with their corresponding monomeric porphyrins. The order of the first reduction potentials is observed as the porphyrin free‐base<Ni2+≈Cu2+<Zn2+, and that of the first oxidation potentials is entirely contradictory. The electrochemical results also indicate that the dimeric porphyrins show two‐electron redox behavior.