Infrared, Raman and far infrared spectra, ab initio calculations, and internal rotation of 3-fluoro-3-methyl-1-butyneElectronic supplementary information (ESI) available: symmetry coordinates for vibrations (Table S1), symmetry selection rules for torsional transitions (Table S2), minimum, maximum and saddle point of potential function (Table S3), and predicted infrared and Raman intensities (Table S4). See http://www.rsc.org/suppdata/cp/b4/b404641b/.
作者:Gamil A. Guirgis、Stephen Bell、Peter Groner、Chao Zheng、James R. Durig
DOI:10.1039/b404641b
日期:——
The infrared (3500–60 cm−1) spectrum of the gas and Raman (3500–20 cm−1) spectra of liquid and solid 3-fluoro-3-methyl-1-butyne, HCCCF(CH3)2, have been recorded. Ab initio calculations of energies, geometrical structures, vibrational frequencies, infrared intensities, Raman activities and the potential energy function for the methyl torsions have been carried out to assist in the interpretation of
气体的红外 (3500-60 cm-1) 光谱和液体和固体 3-fluoro-3-methyl-1-butyne, HCCCF(CH3)2 的拉曼 (3500-20 cm-1) 光谱已被记录. 已经对甲基扭转的能量、几何结构、振动频率、红外强度、拉曼活动和势能函数进行了从头算计算,以帮助解释光谱。在 259 cm-1 处观察到同相基本扭转模式,其中一系列序列峰值下降到较低频率。通过利用耦合的双顶转子模型,已经分配了其中五个频带,并且通过改变有效三重障碍值和 V'33 项,同时利用 B3LYP/6- 预测的 V33 和 V6 项来拟合它们的频率31G(d) 和 MP2(full)/6-31G(d) 计算。分别从它们的拟合中获得了 1324 ± 14 cm-1 (3.79 ± 0.04 kcal mol-1) 和 1338 ± 27 cm-1 (3.83 ± 0.08 kcal mol-1)