centres. The gas phase UV-photoelectron spectra of the diphosphines 1–6 have been measured. Their first two ionisation potentials are found to be nearly degenerate and all are in the low energy range from 7.5 to 7.8 eV. Comparison with related mono- and bidentate phosphines demonstrates that 1–6 are excellent σ-donors towards metals, in accord with their known coordination chemistry. Molecular geometries
一系列的高度拥挤对称和不对称diphosphinomethanes - [R 2
PCH 2 PR' 2,重要
配体在过渡
金属
化学和催化方面,即t Bu 2
PCH 2 P t Bu 2 (dtbpm,1),Cy 2
PCH 2
PCy 2 (dcpm,2),t Bu 2
PCH 2
PCy 2 (ctbpm,3),t Bu 2
PCH 2 P i Pr 2 (iptbpm,4)和t Bu 2
PCH 2 PPh 2 (ptbpm,5),已使用一般便捷的路线以高收率制备,详细说明请参见1。除4是无色液体外,这些化合物在室温下为结晶固体。它们的分子结构已经通过单晶X射线衍射以及更高的同系物1,t Bu 2 CH 2 CH 2 t Bu 2 (dtbpe,6)进行了测定。的
氧化钛的固态结构1,吨卜2 P(O)CH 2 P(O)吨卜2 (7),和两个phospho阳离子衍生自1的质子化[ t Bu