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Exchange of a β-methine unit for an N atom of a pyrrole ring of a porphyrin leads to a new type of porphyrin isomer, which is formed by condensation of pyrrole and P-tolylaldehyde. NiII ions are surprisingly coordinated by 1 as tetradentate ligand, that is through the three N atoms and the C atom of the inner cycle. The framework of the green metalloporhyrin is planar.
Chmielewski et al. (Mon,) studied this question.