화학공학소재연구정보센터
Inorganic Chemistry, Vol.40, No.26, 6788-6793, 2001
Chromium corroles in four oxidation states
We have isolated and characterized chromium complexes of 5,10,15-tris(pentafluorophenyl)corrole [(tpfc)H-3] (1) in four oxidation states: [(tpfc*)CrO][SbCl6] (6): [(tpfc)CrO] (2); [(tpfc)CrO][Cp2Co] W and [(tpfc)Cr(py)(2)] (3). Complex 6 was prepared both by electrochemical and chemical oxidation of 2 its formulation as a (CrO)-O-V ligand-radical species is based on UV-visible absorption as well as EPR measurements. Cobaltocene reduction of 2 gave 4, it was identified as a diamagnetic d(2) (CrO)-O-IV complex from its sharp H-1 NMR spectrum. Reaction of 2 with triphenylphosphine yielded a chromium(III) corrole, [(tpfc)Cr(OPPh3)(2)] (5). Owing to its air sensitivity, 5 could not be isolated in the absence of excess OPPh3. The structure of the Cr-III bis-pyridine complex (3) was determined by X-ray crystallography (Cr-N distances: 1.926-1.952 Angstrom, pyrrole: 2,109, 2.129 Angstrom, pyridine).