Magnetic circular dichroism spectroscopic studies on the stereochemistry and coordination behavior of nickel porphyrins

MCD spectroscopic studies of the electronic structures and coordination behaviors of three nickel porphyrins that have different patterns and amounts of macrocycle deformations reveals A-term peaks for all three compounds, indicating that both ruffled and saddle-shaped conformations retain D(2d) symmetry. MCD spectra of Ni(II) protoporphyrin IX-reconstituted hemoglobin ((Ni)Hb) and myoglobin ((Ni)Mb) reveal that protein does not influence the energy level of nickel porphyrins.