Resonance Raman Studies on Mn（Ⅲ） Protoporphyrin Ⅸ Dimethyl Ester Complexes

Resonance Raman spectra （RRS） and UV spectra of Mn （Ⅲ） X-proto-porphyrin Ⅸ dimethyl ester （PP） complexes have been studied. Only the Raman bands in the low-wavenumber region (＜500cm^-1), i.e. the bands involving the central metal, are effected by the different axial ligands （X）, but not the bond vibrations of the porphyrin ring; the λmax of the UV spectra increase in the order of the F^-＜^-OAc＜Cl^-＜Br^-＜I^-. We assign UV absorption bands （Ⅰ—Ⅵ） of MnXPP to electronic transition bands involving d orbitals of Mn³⁺. They are mainly charge transfer transition bands.