The coordinatively unsaturated ruthenium(II) complexes [Ru(η6-C6R6)(η-amidinate)]+X− (R = H, Me, X = TFPB, PF6), being isoelectronic with Ru(η5-C5Me5)(η-amidinate), have been isolated and characterized by spectroscopy and crystallography. A weak π-coordination of the amidinate ligands in the solid state was observed by X-ray crystallography. DFT calculations also suggest that such a coordination mode contributes to the stabilization of these complexes. These complexes behave as highly reactive transition metal Lewis acids in the reactions with various two-electron donor ligands.
通过光谱学和晶体学方法分离并鉴定了与Ru(η5-C5Me5)(η-amidinate)同电的、协调性不饱和
钌(II)配合物[Ru(η6-C6R6)(η-amidinate)]+X− (R = H, Me, X =
TFPB, PF6)。通过X射线晶体学方法观察到了固态下酰胺
配体与π的弱配位作用。DFT计算也表明,这种配位模式有助于稳定这些配合物。在与各种双电子供体
配体反应时,这些配合物表现出高反应性的过渡
金属
路易斯酸性质。