MOSSBAUER SPECTROSCOPIC CHARACTERIZATION OF IRON METHYL PYROPHEOPHORBIDE A AND ITS DERIVATIVES

Two kinds of iron chlorophylls, i.e. (methyl pyropheophorbide a)iron(I II) chloride and its bis-pyridine adduct, were prepared and characteri zed by Fe-57 Mossbauer spectroscopy. (Methyl pyropheophorbide a)iron(I II) chloride gave an asymmetric quadrupole-split doublet typical of hi gh-spin iron(III) chlorophylls, while its bis-pyridine adduct showed a symmetric quadrupole-split doublet characteristic of low-spin iron(II ) chlorophylls. The isomer shift and quadrupole splitting obtained for (methyl pyropheophorbide a)iron(III) chloride and its bis-pyridine ad duct have led to the following conclusions. The substitution of the bu lky phytyl group for the methyl group hardly affects the electronic st ate of the iron(II,III) ion, but the elimination of the methoxycarbony l group increases the planarity of the macrocyclic chlorin ligand.