Synthesis, X-ray and spectroscopic characterisation of chromium(III) coordination compounds with benzimidazolic ligands

Article abstract of DOI:10.1016/S0277-5387(00)00458-7

The syntheses and characterisation of chromium(III) complexes with tris(2-benzimidazolylmethyl)amine (ntb), 2-guanidinobenzimidazole (2gb), 2,6-bis(2-benzimidazolyl)pyridine (bbimpy) and 2-(2-pyridyl)benzimidazole (2pb), of composition [Cr(ntb)Cl₂]Cl·4.5H₂O (1), [Cr(2gb)₃]Cl[ZnCl₄]·CH₃OH (2), [Cr(2gb)₃]Cl₃·4H₂O (3), [Cr₂(2gb)₄(μ-OH)₂](ClO₄)₄·5H₂O (4), [Cr(b-bimpy)Cl₃] (5) and [Cr(2pb)₂Cl₂]Cl·C₂H₅OH·0.5H₂O (6) are presented. The compounds are obtained from Cr(III)in alcoholic solution, or a Cr(II) aqueous acidic solution. The latter were carried out under air-free conditions. The reaction of 2gb with Cr(II) in aqueous solution yielded a dinuclear compound. The X-ray crystal structures of 1 and 4 are discussed. (C) 2000 Elsevier Science Ltd.