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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Intermolecular Force Fields of Large Molecules by the Fragmentation Reconstruction
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Intermolecular Force Fields of Large Molecules by the Fragmentation Reconstruction

机译:大分子的分子间力场的碎片重建。

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摘要

A new intermolecular force field for the liquid-crystal-forming molecule 5CB(4-cyano,4'n-pentyl biphenyl)has been derived from two-body interaction energies,obtained by the fragmentation reconstruction method(FRM).The accuracy of this purely quantum mechanical approach has been verified by comparing FRM and directly ab initio computed interaction energies,obtaining a very satisfactory agreement with a maximum absolute error lower than 0.4 kcalAnol.The comparison was performed for a large number of internal geometries and dimer arrangements of two fragments of 5CB,namely,4-cyano biphenyl(OCB)and n-pentyl benzene(5B).The potential energy surface of the 5CB dimer has then been used to parametrize a many-site model interaction potential suitable for computer simulations.
机译:利用断裂重建法(FRM)获得了两体相互作用能,从而为液晶形成分子5CB(4-氰基,4'n-戊基联苯)提供了一个新的分子间力场。通过比较FRM和直接从头算出的相互作用能验证了纯量子力学方法,获得了非常令人满意的协议,最大绝对误差低于0.4 kcalAnol。该比较是针对两个片段的大量内部几何结构和二聚体排列进行的5CB,即4-氰基联苯(OCB)和正戊基苯(5B)。然后将5CB二聚体的势能面用于参数化适合计算机模拟的多站点模型相互作用势。

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