Re(I)(tricarbonyl)(+) complexes with the 2-(2-pyridyl)-N-methyl-benzimidazole, 2-(2-pyridyl)benzoxazole and 2-(2-pyridyl)benzothiazole ligands - syntheses, structures, electrochemical and spectroscopic studies

摘要

The reactions of Re(CO)(5)Cl with the chelating ligands 2-(2-pyridyl)-N-methylbenzimidazole, 2-(2-pyridyl)benzoxazole and 2-(2-pyridyl)benzothiazole afforded neutral fac-Re(COWL)Cl and ionic fac-Re(CO)(3) (L) (acetonitrile)+PF6- complexes with structures confirmed by means of X-ray measurements. UV-vis absorption and emission properties have been studied at room and 77 K temperatures in order to determine the nature of the lowest electronically excited states. Electrochemical behaviour of the investigated fac-Re(CO)(3)(L)Cl and fac-Re(CO)(3) (L) (acetonitrile)+PF6- complexes has been studied using cyclic and square-wave voltammetry. Preliminary results from the electrogenerated chemiluminescence studies of the ionic fac-Re(CO)(3)(L)(acetonitrile)+PF6- and the neutral fac-Re(CO)(3)(MPBI)Cl complexes are briefly presented. (c) 2005 Elsevier B.V. All rights reserved.