Imidazole-based bifunctional chelates for the “fac-[Re(CO)3]+” core
摘要:
Three monocationic rhenium(I) complexes of the type [Re(CO)(3)(L)]Br, containing the bis-imidazole tridentate ligands bis-(2-(1-methylimidazolyl)methyl)amine (L), bis-(2-(I-methylimidazolyl)methyl)aminoethanoI (L 2) and bis-(2-(benzimidazolyl)ethyl)sulfide (L-3), were prepared and characterized by H-1 NMR and IR spectroscopy. The complex. salt [Re(CO)(3)(L-2)]Br (2) was also characterized by X-ray crystallography. The structure consists of discrete monocationic monomers with a fac-[Re(CO)(3)](+) coordination unit, and the remaining three sites are occupied by one amine and two imidazolyl nitrogen donor atoms. (C) 2007 Elsevier Ltd. All rights reserved.
pH-metric titration studies in methanol disclose that the ligand in [Fe(HL)(DBC)]+ is protonated. The [Fe(L)(DBC)] adducts of iron(III) complexes of bis(pyridyl)-based ligands (1,2) afford higher amounts of intradiol-cleavage products, whereas those of mono/bis(imidazole)-based ligands (4,5) yield mainly the auto-oxidation product benzoquinone. It is remarkable that the adducts [Fe(HL)(DBC)]+/[Fe(HL3)(DBC)X]
Imidazole-based bifunctional chelates for the “fac-[Re(CO)3]+” core
作者:Zenixole R. Tshentu、Thomas I.A. Gerber、Ryan Walmsley、Peter Mayer
DOI:10.1016/j.poly.2007.09.022
日期:2008.1
Three monocationic rhenium(I) complexes of the type [Re(CO)(3)(L)]Br, containing the bis-imidazole tridentate ligands bis-(2-(1-methylimidazolyl)methyl)amine (L), bis-(2-(I-methylimidazolyl)methyl)aminoethanoI (L 2) and bis-(2-(benzimidazolyl)ethyl)sulfide (L-3), were prepared and characterized by H-1 NMR and IR spectroscopy. The complex. salt [Re(CO)(3)(L-2)]Br (2) was also characterized by X-ray crystallography. The structure consists of discrete monocationic monomers with a fac-[Re(CO)(3)](+) coordination unit, and the remaining three sites are occupied by one amine and two imidazolyl nitrogen donor atoms. (C) 2007 Elsevier Ltd. All rights reserved.