Influence of Metallo Core Variation on 1-Methylimidazole Ligation to the Iron(III) in Porphyrin, Porphycene, Corrphycene, and Hemiporphycene

Binding of 1-methylimidazole to five-coordinate iodo-Fe(III) complexes of porphyrin and three porphyrin isomers was spectrophotometrically examined in benzene at 20 °C. The result demonstrates that the geometry of the metallocavity is important to control both iron movement through the aromatic plane and magnitude of the Fe–I interactions.