Guanidinates as chelating anionic ligands for early, middle and late transition metals: syntheses and crystal structures of [Ti{η2-(NPh)2CNEt2}2Cl2], [Ru{η2-(NPh)2CNHPh}3] and [Pt{η2-(NPh)2CNHPh}2]
作者:Philip J. Bailey、Keith J. Grant、Lindsey A. Mitchell、Stuart Pace、Andrew Parkin、Simon Parsons
DOI:10.1039/b001992p
日期:——
Treatment of the dimeric ruthenium halide complex [Ru(η-C6H6)Cl2]2 with 1,2,3-triphenylguanidine provided the tris-chelate [Ruη2-(NPh)2CNHPh}3] with loss of the aromatic ligand and metal oxidation. This product may also be prepared by treatment of the previously reported [Ru(η-p-PriC6H4Me)η2-(NPh)2CNHPh}Cl] with bases (KOH, LiNiPr2, NEt3). Complexes containing chelating guanidinate ligands are also available by means of metathesis of the monolithiated ligands Li[C(NR)2NR2] with metal halide complexes, as exemplified by the synthesis of the square planar bis-chelate [Ptη2-(NPh)2CNHPh}2] from [Pt(PhCN)2Cl2] and [Tiη2-(NPh)2CN(Et)2}2Cl2] from [TiCl4(THF)2]. The characterisation of these complexes allows a comparison of the co-ordination properties of chelating guanidinates with early, middle and late transition metals.
用 1,2,3-三苯基胍处理二聚卤化钌配合物 [Ru(δ--C6H6)Cl2]2,可得到三螯合物 [Ruδ-2-(NPh)2CNHPh}3],同时芳香配体消失,金属氧化。这种产物也可以通过用碱(KOH、LiNiPr2、NEt3)处理之前报道过的[Ru(δ-p-PriC6H4Me)δ-2-(NPh)2CNHPh}Cl]来制备。通过单锂配体 Li[C(NR)2NR2] 与金属卤化物络合物的偏析反应,也可以得到含有螯合胍配体的络合物、以[Pt(PhCN)2Cl2]合成方形双螯合物[Ptδ-2-(NPh)2CNHPh}2]和[TiCl4(THF)2]合成[Tiδ-2-(NPh)2CN(Et)2}2Cl2]为例。通过分析这些配合物的特性,可以比较胍类螯合物与早期、中期和晚期过渡金属的配位特性。