Journal
JOURNAL OF INORGANIC BIOCHEMISTRY
Volume 91, Issue 3, Pages 423-436Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S0162-0134(02)00484-1
Keywords
corrole; metallocorrole; high-valent; noninnocence; chloroperoxidase
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For relatively electron-rich corrole ligands, the halfwave potentials for oxidation of Cu(III), Sn(IV)Ph, Fe(IV)Ph, and Fe(IV)-O-Fe(IV) complexes are significantly lower than those of Sn(IV)Cl, Fe(IV)Cl. Mn(IV)Cl, and Cr(V)(0) complexes, suggesting that the corrole ligand is relatively electron-rich or 'innocent' in the former group of complexes and that it is relatively electron-deficient or 'noninnocent' in the latter group. Both the formal charge of the central metal ion and the nature of the axial ligand, if any, appear to be key determinants of the electronic character of the corrole ligand in metallocorrole complexes, a theme that has interesting resonances with recent findings on high-valent heme protein intermediates. However, for very strongly electron-deficient ligands such as meso-tris(pentafluorophenyl)corrole (TPFPC) and beta-octabromo-meso-tris(pentafluorophenyl)corrole (Br8TPFPC), which cannot sustain significant radical character, the various metal complexes all exhibit comparable halfwave potentials for oxidation and the ligand may be considered to be relatively innocent, (C) 2002 Elsevier Science Inc. All rights reserved.
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