Dichlorophosphanyl isocyanate – spectroscopy, conformation and molecular structure in the gas phase and the solid state
作者:Dingqing Li、Jan Schwabedissen、Hans-Georg Stammler、Norbert W. Mitzel、Helge Willner、Xiaoqing Zeng
DOI:10.1039/c6cp05377g
日期:——
Dichlorophosphanyl isocyanate, Cl2PNCO, was synthesized and characterized by IR, Raman and 31P NMR spectroscopy. The conformational properties and molecular structures were studied by using gas electron diffraction (GED), X-ray crystallography and quantum-chemical calculations. Extensive DFT and ab initio calculations show that the potential energy surface of Cl2PNCO upon rotating the P–N bond is rather
合成了二氯膦基异氰酸酯Cl 2 PNCO,并通过IR,拉曼和31 P NMR光谱进行了表征。利用气体电子衍射(GED),X射线晶体学和量子化学计算研究了其构象性质和分子结构。大量的DFT和从头算计算表明,旋转P–N键时Cl 2 PNCO的势能表面相当平坦;反之亦然。理论上预测了NCO基团与ClPC1角的等分线之间的三个构象异构体,即syn,anti和gauche。实验上,气相红外光谱法只能指示一种构象异构体,通过气相电子衍射和X射线晶体学数据明确地确定了气相和固态的gauche构象。在固态状态下,Cl 2 PNCO分子采用具有两个不同的二面角Cl–P–N–C -121.3(2)和137.4(2)°的gauche构象,并通过弱分子间C⋯O接触形成聚合物链。另外,在气相中检查了Cl 2 PNCO的异氰酸酯基的位置的动态特征。