The reaction of tetraphenylporphyrin with niobium pentachloride leads to a niobioporphyrin which, when treated with acetic acid, gives an acetate; an X-ray study shows that the metal is seven-co-ordinated in this acetate.
C. Lecomte, J. Protas, R. Guilard, B. Fliniaux and P. Fournari, J. Chem. Soc., Chem. Commun., 1976, 434 DOI: 10.1039/C39760000434
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