concentrations < 0.1 M, the relative concentrations of the [PtCl5(H2O)]- and [PtCl4(H2O)2] species increase significantly, as a result of relatively rapid aquation of the [PtCl6]2- and [PtCl5(H2O)]- complexes under these conditions. From this (195)Pt NMR data the aquation constants of [PtCl6]2- and [PtBr6]2- of log K6 approximately 1.75 +/- 0.05 and log K6 approximately 2.71 +/- 0.15, respectively, have been determined
进行了详细的195Pt NMR研究,研究了H2PtCl6,H2PtBr6和H2PtCl6 / H2PtBr6在
水/稀HClO4中的混合物形成的
水中Pt(IV)配合物的分布,从而了解了这些溶液中的形态与从工艺溶液中回收Pt(IV)配合物有关。[PtCl6] 2-,[PtCl5(
H2O)]-和[PtCl4( )2]的物种分布图显示,在平衡,相对浓缩的H2PtCl6溶液([Pt] t> 0.12 M)中,[PtCl4 ( )2]的种类低于195Pt NMR的检测限;当[PtClt] t浓度<0.1 M时,[PtCl5( )]-和[PtCl4( )2]的相对浓度显着增加,这是由于[PtCl6] 2-和[在这些条件下形成PtCl5( )]-络合物。根据该(195)Pt NMR数据,分别在30度下确定log K6的[PtCl6] 2-和[PtBr6] 2-的
水合常数分别约为1.75