The oxidation of Ni-porphyrin dimer with PbO or MnO resulted in the simultaneous implementation of an -heterocycle-fused bridge and a modified pyrrole to give three unprecedented porphyrin dimers , , and . The reduction of smoothly afforded . The structures of these dimers were all unambiguously confirmed by X-ray crystallographic analysis. These dimers show significantly red-shifted absorption bands and perturbed electrochemical properties with a decreasing HOMO-LUMO gap in the order of > > > .
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