Magnetic circular dichroism coordination geometry

Mascharak et al. 63) have prepared a structural BLM model PMAH containing pyrimidine, imidazole, and primary and secondary amine building blocks. The iron -PMAH complex was studied by X-ray absorption, magnetic circular dichroism, and resonance Raman spectroscopy 63). This Fe-BLM model exhibits a five-coordinate, square pyramidal geometry in the solid state and a distorted octahedral geometry in solution with a solvent molecule at the sixth position. Similar spectral features have been found for Fe -BLM. This PMAH-Fe" complex binds O2 to generate PMAH-Fe "-OOH, a low-spin hydroperoxo-iron(III) complex 64) able to promote the lipid peroxidation as BLM 65). 

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