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Structure, Dynamics, and Accurate Laboratory Rotational Frequencies of the Acrylonitrile-Methanol Complex

机译:丙烯腈 - 甲醇复合物的结构,动力学和精确的实验室旋转频率

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摘要

The hydrogen-bonded complex between acrylonitrile (CH2=CHCN) and methanol has been characterized spectroscopically in the millimeter wave range (59.6-74.4 GHz) using a free jet absorption millimeter wave spectrometer. Precise values of the rotational and centrifugal distortion constants were obtained from the measured frequencies of the complex of acrylonitrile with CH3OH and CD3OD. The analysis of the splittings of the rotational lines due to the hindered internal rotation of the methanol methyl group led to the determination of a V-3 value of 221.9(7) and 218(5) cm(-1) for the complexes of CH3OH and CD3OD, respectively, and these values are about 40% lower than that of free methanol. The structure of the observed conformation is in agreement with the global minimum determined at the MP2/aug-cc-pVTZ level of calculation, and the counterpoise corrected intermolecular binding energy, obtained at the same theoretical level, is D-e = 26.3 kJ mol(-1)
机译:使用自由喷射吸收毫米波光谱仪在毫米波范围(59.6-74.4GHz)中,在毫米波范围(59.6-74.4GHz)中,在毫克腈(CH2 = CHCN)和甲醇之间的氢键复合物。 从用CH 3 OH和CD3OD的丙烯腈复合物的测量频率获得旋转和离心畸变常数的精确值。 由于甲醇甲基的受阻内旋转而导致旋转线的分裂的分析导致了CH 3 OH的配合物的V-3值的v-3值为221.9(7)和218(5)厘米(-1) 分别和CD3OD,这些值比游离甲醇低约40%。 观察到的构象的结构与在MP2 / AUG-CC-PVTZ计算水平上确定的全局最小值,以及在相同的理论水平下获得的逆分辨率校正的分子结合能量是DE = 26.3 kJ摩尔( - 1)

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