Synthesis and Characterization of Diplatinum Complexes Containing Bridging μ-η<sup>2</sup>-H−SiHAr Ligands. X-ray Crystal Structure Determination of {(Ph<sub>3</sub>P)Pt[μ-η<sup>2</sup>-H−SiHAr]}<sub>2</sub> (Ar = 2,4,6-(CF<sub>3</sub>)<sub>3</sub>C<sub>6</sub>H<sub>2</sub>, C<sub>6</sub>Ph<sub>5</sub>)
作者:J. Braddock-Wilking、Y. Levchinsky、N. P. Rath
DOI:10.1021/om000602r
日期:2000.12.1
fluxional on the NMR time scale. Only the trans isomer is generated with Ar = PPP, RF. These complexes exhibit an unusual low-field 1H NMR resonance for the terminal Si−H and an upfield shift for the bridging hydride. X-ray crystallographic analysis of the PPP and RF systems (also previous results for IMP) reveal two different Si−Pt distances, with the longer distance corresponding to the Pt···H···Si interaction
双核铂硅配合物,[(PH 3 P)的Pt(μ- η 2 -H-SiHAr)] 2(AR = 2-异丙基-6-甲基苯基(IMP),2,4,6-三甲氧基苯基(TMP), 2,4,6-三甲基苯基(MES),pentaphenylphenyl(PPP),2,4,6-三(三氟甲基)苯基(R ˚F))已从ArSiH反应合成3用(PH 3 P)2的Pt(η 2 -C 2 H ^ 4)。这些配合物通过多核NMR和IR光谱以及X射线晶体学(PPP和R F系统)。双核络合物对Pt···H···Si包含3c-2e非经典相互作用,这由光谱和晶体学数据支持。当Ar = IMP,TMP,Mes时,会同时形成顺式和反式异构体,并且这些络合物在NMR时标上呈流变态。Ar = PPP,R F时仅生成反式异构体。这些配合物对末端Si-H表现出不同寻常的低场1 H NMR共振,对桥接氢化物表现出高场偏移。PPP和R F系统的X