SPECTROELECTROCHEMISTRY OF IRON COMPLEXES OF THE C2-CAPPED PORPHYRIN LIGAND

The coordination chemistry of iron complexes of C2-capped porphyrin li gand has been examined by spectroelectrochemistry. In solution, in dim ethylsulphoxide (DMSO), the chloride ion of [Fe(III)(C2cap)Cl] remaine d bound to iron(III). In the presence of 1-methylimidazole (1-MeIm) th e Cl- ion is substituted by OH-, generated by reaction of 1-MeIm with trace amounts of water in the system. Controlled potential reduction o f [Fe(III)(C2cap)(OH)] in DMSO solution produced the six-coordinate ir on(II) complex [Fe(II) (C2cap)(1-MeIm)(DMSO)], with the DMSO ligand bo und within the capping group. Reduction of [Fe(III)(C2cap)Cl], in solu tion in CH2Cl2 containing 1-MeIm, produced the five coordinate iron(II ) species, Fe(II)(C2cap)(1-MeIm).