Infrared and Raman spectra, conformational stability, ab initio calculations, and vibrational assignments for methylaminothiophosphoryl difluoride
作者:B.J van der Veken、R.S Sanders、J Xiao、J.R Durig
DOI:10.1016/s0022-2860(00)00759-6
日期:2001.1
Abstract Infrared spectra (4000–50 cm −1 ) of the vapor, amorphous and crystalline solids and Raman spectra (3600–10 cm −1 ) of the liquid with qualitative depolarization data as well as the amorphous and crystalline solids of methylaminothiophosphoryl difluoride, CH 3 N(H)P(=S)F 2 , and three deuterated species, CD 3 N(H)P(=S)F 2 , CH 3 N(D)P(=S)F 2 , and CD 3 N(D)P(=S)F 2 , have been recorded. The
摘要 蒸气、无定形和结晶固体的红外光谱 (4000–50 cm -1 ) 和具有定性去极化数据的液体的拉曼光谱 (3600–10 cm -1 ) 以及甲氨基硫代磷酰二氟化物、CH 的无定形和结晶固体3 N(H)P(=S)F 2 和三种氘代物质,CD 3 N(H)P(=S)F 2 、CH 3 N(D)P(=S)F 2 和 CD 3 N (D)P(=S)F 2 ,已被记录。光谱表明在蒸气、液体和无定形固体中存在少量第二构象异构体,而只有一种构象异构体保留在低温结晶相中。蒸气的近红外光谱证实了气相中存在两种构象异构体。蒸气的不对称顶部轮廓模拟表明反式构象异构体是主要的气相构象异构体。根据液体的拉曼光谱的温度研究,反式和近顺式构象异构体之间的焓差确定为 368±15 cm -1 (4.41±0.2 kJ/mol),其中反式构象异构体在热力学上是优选的。Ab Initio 计算和结构优化使用 6-31G(d)