Chemistry Letters, Vol.33, No.2, 140-141, 2004
FT-IR and theoretical analysis of the characteristic bonding properties in the multiplet metal porphyrin carbene complexes
FT-IR and theoretical studies of the d(6) and d(7)-porphyrin carbene complexes revealed that the metal-C-carbene bond is a double bond in the singlet state, while the metal-Ccarbene bond is a single bond in the multiplet state. Since the radical on the C-carbene delocalized to the alpha-carbonyl group, the stretching of the C=O double bond shifted downward in the multiplet states.