首页> 外文期刊>The Journal of Chemical Physics >The extremely flat torsional potential energy surface of oxalyl chloride - art. no. 234313
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The extremely flat torsional potential energy surface of oxalyl chloride - art. no. 234313

机译:草酰氯的极其平坦的扭转势能表面-艺术没有。 234313

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The conformational behavior of oxalyl chloride has been investigated using ab initio Hartree-Fock (HF) and second-order Moller-Plesset (MP2) perturbation theories, and the coupled-cluster singles and doubles method appended with a perturbative inclusion of connected triple excitations [CCSD(T)]. Correlation consistent polarized valence quadruple-zeta (cc-pVQZ) and quintuple-zeta (cc-pV5Z) basis sets were used in this research. At the cc-pVQZ and cc-pV5Z HF levels, there is no stationary point corresponding to a stable gauche conformer. On the other hand, at the cc-pVQZ and cc-pV5Z MP2 levels and with the cc-pVQZ CCSD(T) method, the gauche conformer of oxalyl chloride was found at O=C-C=O dihedral angles of 81.9 degrees, 79.4 degrees, and 83.4 degrees, respectively. At the cc-pV5Z MP2 level, the energy barrier from trans to gauche was predicted to be 0.74 kcal mol(-1) and that from gauche to trans to be 0.09 kcal mol(-1). Thus, the potential-energy surface along the O=C-C=O torsional mode is exceedingly flat. The existence of the gauche conformation is mainly due to the minimization of steric repulsion. (C) 2005 American Institute of Physics.
机译:草酸氯的构象行为已使用从头算起的Hartree-Fock(HF)和二阶Moller-Plesset(MP2)扰动理论进行了研究,耦合簇单双打方法附加了扰动包含连接的三重激发[ CCSD(T)]。在这项研究中使用了相关一致的极化价四元组(cc-pVQZ)和五元组(cc-pV5Z)基础集。在cc-pVQZ和cc-pV5Z HF水平,没有固定点对应于稳定的薄纱构象异构体。另一方面,在cc-pVQZ和cc-pV5Z MP2水平下,使用cc-pVQZ CCSD(T)方法,发现草酰氯的薄纱构象构型在O = CC = O二面角分别为81.9度,79.4度,和83.4度。在cc-pV5Z MP2水平上,从反式到薄纱的能垒被预测为0.74 kcal mol(-1),从薄纱到反面的能垒为0.09 kcal mol(-1)。因此,沿O = C-C = O扭转模式的势能表面非常平坦。 gauche构象的存在主要是由于空间排斥力最小。 (C)2005美国物理研究所。

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