Mono and dinuclear arene ruthenium complexes containing 6,7-dimethyl-2,3-di(pyridine-2-yl)quinoxaline as chelating ligand: Synthesis and molecular structure

摘要

The mononuclear cations of the general formula [(η-arene)RuCl(dpqMe)] (dpqMe = 6,7-dimethyl-2,3-di(pyridine-2-yl)quinoxaline; arene = CH, ; CHMe, ; -PrCHMe, ; CMe, ) as well as the dinuclear dications [(η-arene) RuCl(μ-dpqMe)] (arene = CH, ; CHMe, ; -PrCHMe, ; CMe, ) have been synthesised from 6,7-dimethyl-2,3-di(pyridine-2-yl)quinoxaline (dpqMe) and the corresponding chloro complexes [(η-CH)Ru(μ-Cl)Cl], [(η-CHMe)Ru(μ-Cl)Cl], [(η--PrCHMe)Ru(μ-Cl)Cl] and [(η-CMe)Ru(μ-Cl)Cl], respectively. The X-ray crystal structure analyses of [][PF], [][PF] and [][PF]2 reveal a typical piano-stool geometry around the metal centre; in the dinuclear complexes the two chloro ligands, with respect to each other, are found to be trans oriented.