作者:Bettina Römer、Geo G. Gatev、Meili Zhong、John I. Brauman
DOI:10.1021/ja970279s
日期:1998.4.1
The electron affinity of the bis(dimethylphosphino)methyl radical was measured to be 35.3 ± 0.2 kcal/mol, using electron photodetachment spectroscopy in an ion cyclotron resonance spectrometer. Using equilibrium measurements, of bis(dimethylphosphino)methane and bis(trimethylsilyl)methane was determined to be 370 ± 3 and 373 ± 3 kcal/mol, respectively. From measured and known electron affinities and
使用离子回旋共振光谱仪中的电子光分离光谱测量双(二甲基膦基)甲基自由基的电子亲和力为 35.3 ± 0.2 kcal/mol。使用平衡测量,双(二甲基膦基)甲烷和双(三甲基甲硅烷基)甲烷分别被确定为 370 ± 3 和 373 ± 3 kcal/mol。从测量和已知的电子亲和力和气相酸度,我们推导出 C-H 键解离能:双(二甲基膦基)甲烷,92 ± 3 kcal/mol,和双(三甲基甲硅烷基)甲烷,95 ± 3 kcal/mol。三甲基膦的浓度为 383-387 kcal/mol。甲硅烷基和膦基取代的 α 稳定作用很大,并且在大小上与硫基和氯取代的稳定作用相当。讨论了可能的稳定机制。