首页> 外文期刊>The Journal of Chemical Physics >MICROWAVE SPECTROSCOPIC AND AB INITIO STUDIES OF THE HYDROGEN-BONDED TRIMETHYLAMINE-HYDROGEN SULFIDE COMPLEX
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MICROWAVE SPECTROSCOPIC AND AB INITIO STUDIES OF THE HYDROGEN-BONDED TRIMETHYLAMINE-HYDROGEN SULFIDE COMPLEX

机译:氢键的三乙胺-硫化氢配合物的微波光谱和从头算研究

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Rotational spectra have been recorded for six isotopomers of the trimethylamine-hydrogen sulfide complex using a Fourier-transform microwave spectrometer. The spectra are characteristic of a symmetric top (B+C)/2=1395.363 (1) MHz, and are indicative of free internal rotation of H2S about the trimethylamine symmetry axis. A structure with a single, linear hydrogen bond, with an S-N distance of 3.36 (5) Angstrom, best reproduces the moments of inertia of six isotopomers, including three distinct deuterated complexes. The experimental structure is compared to an ab initio structure optimized at the MP2/6-31+G(d,p) level which predicts an S-N distance of 3.328 Angstrom. MP2/aug'-cc-pVTZ calculations were used to determine the binding energy of the complex (Delta E-e=-5.8 kcal/mol) and the barrier to an internal tunnelling motion which exchanges the two H2S hydrogens (3.0 kcal/mol). (C) 1997 American Institute of Physics. [References: 26]
机译:已经使用傅立叶变换微波光谱仪记录了三甲胺-硫化氢络合物的六个异构体的旋转光谱。光谱是对称顶部(B + C)/2=1395.363(1)MHz的特征,并且指示H2S绕三甲胺对称轴自由内部旋转。具有单个线性氢键的结构,S-N距离为3.36(5)埃,可以最佳地再现六个同位异构体(包括三个不同的氘代配合物)的惯性矩。将实验结构与在MP2 / 6-31 + G(d,p)水平优化的从头算结构进行了比较,该结构预测S-N距离为3.328埃。 MP2 / aug'-cc-pVTZ计算用于确定复合物的结合能(ΔE-e = -5.8 kcal / mol)和内部隧穿运动的势垒,该内部隧穿运动交换两个H2S氢(3.0 kcal / mol)。 (C)1997美国物理研究所。 [参考:26]

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