The 57Fe n.m.r. chemical shifts and complex formation constants of some carbonyl iron porphyrin complexes have been measured; the 57Fe n.m.r. chemical shift shows a large upfield shift with increased binding strength between the axial nitrogen ligand and the iron atom.
L. Baltzer and M. Landergren, J. Chem. Soc., Chem. Commun., 1987, 32 DOI: 10.1039/C39870000032
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