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The extremely flat torsional potential energy surface of oxalyl chloride

机译:草酰氯的极其平坦的扭转势能面

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The conformational behavior of oxalyl chloride has been investigated using ab initio Hartree-Fock(HF)and second-order M011er-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 81.9deg,79.4deg,and 83.4deg,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 kcalmol~(-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.
机译:使用从头算起的Hartree-Fock(HF)和二阶M011er-Plesset(MP2)扰动理论对草酰氯的构象行为进行了研究,并在耦合簇单双打方法后附加了扰动包含连接的三重激发[ CCSD(T)]。本研究使用相关一致的极化价四元组(cc-pVQZ)和五元组(cc-pV5Z)基本集。在cc-pVQZ和cc-pV5Z HF水平下,没有另一方面,在cc-pVQZ和cc-pV5Z MP2含量以及cc-pVQZ CCSD(T)方法下,草酰氯的薄纱构象异构体在O = CC = O的二面角分别为81.9度,79.4度和83.4度。在cc-pV5Z MP2水平下,从反式到薄纱的能垒预计为0.74 kcal mol〜(-1),从薄纱到反面的势垒为0.74 kcal mol〜(-1)。为0.09 kcalmol〜(-1)。因此,沿O = CC = O扭转模式的势能面非常平坦。 f gauche构象主要是由于空间排斥力最小。

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