首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >Ab initio and MNDO Calculations of the ~(35)Cl NQR Parameters of Some Organic and Inorganic Molecules
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Ab initio and MNDO Calculations of the ~(35)Cl NQR Parameters of Some Organic and Inorganic Molecules

机译:一些有机和无机分子〜(35)Cl NQR参数的从头算和MNDO计算

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摘要

The results of ab initio and MNDO calculations of the Cl_2C = CHOCH_3, XCOC1 (X = CH_3, OCH_3 and COCl), 4-ClC_6H_4CH_2Cl, (CNCl)_3 and PCl_5 with total optimization of their geometry are presented. The ab initio calculations were executed using Hartree-Fock theory and the split valence basis set 6-31G~* (RHF/6-31 G~*//RHF/6-31G~*). Using the calculated p-orbital populations of the Cl atoms in these molecules the ~(35)Cl NQR frequencies and asymmetry parameters of the EFG at the ~(35)Cl nuclei have been determined. When the populations of the less diffuse components of orbitals in the split valence basis set are used the calculated and experimenal ν and η values are in good agreement. Linear correlations between these calculated and corresponding experimental ν and η values are obtained. The causes of the nonconformity of the earlier calculated ν and η values and their experimental ones are analysed.
机译:给出了Cl_2C = CHOCH_3,XCOC1(X = CH_3,OCH_3和COCl),4-ClC_6H_4CH_2Cl,(CNCl)_3和PCl_5的从头算和MNDO计算结果,并对其几何进行了整体优化。使用Hartree-Fock理论和分割价基集6-31G〜*(RHF / 6-31 G〜* // RHF / 6-31G〜*)进行从头计算。使用计算出的这些分子中Cl原子的p轨道总体,已经确定了〜(35)Cl核的EFG的〜(35)Cl NQR频率和不对称参数。当使用分裂价基集中的轨道的较少扩散成分的总体时,计算得出的ν和η值与实验值非常吻合。获得这些计算值和相应的实验ν和η值之间的线性相关性。分析了较早计算出的ν和η值不一致的原因及其实验原因。

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