Molecular Electrostatic Potentials from Invariom Point Charges.

Molecular Electrostatic Potentials from Invariom Point Charges.
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Invariom 点电荷的分子静电势

DOI:
10.1002/cphc.201600213
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发表时间:
2016
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
B. Dittrich
B. Dittrich
中科院分区:
--
文献类型:
--
作者:
C. M. Wandtke;J. Lübben;B. Dittrich

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提供了一组用于产生分子静电势的查找点电荷。该集合依赖于不变性数据库的原子分类,该数据库已经被应用于分配单晶X射线衍射中的非球面散射因子。研究的重点是如何提高用点电荷表计算静电电位的准确性。在这方面,将不变点电荷的性能与1)量子化学DFT计算后直接与静电势的约束拟合进行比较,2)半经验AM1 - bcc电荷,以及3)概念上类似的TPACM4查找电荷。不变性分类给出了比TPACM4更好的电荷,尽管表列电荷仍然不如分子特异性计算的电荷。点电荷静电电位也与基于X射线实验的电荷密度研究结果一致,而不需要后者付出相当大的努力。
A set of look‐up point charges for generating molecular electrostatic potentials is provided. The set relies on atom classification of the invariom database, which has already been applied to assign aspherical scattering factors in single‐crystal X‐ray diffraction. The focus of the investigation is on improving the accuracy of electrostatic potentials calculated by using tabulated point charges. In this respect, the performance of invariom point charges is compared with 1) those from a restrained fit to the electrostatic potential directly following quantum‐chemical DFT computations, 2) semi‐empirical AM1‐bcc charges, and 3) conceptually similar TPACM4 look‐up charges. Invariom classification gives charges that perform better than those from TPACM4, although tabulated charges remain inferior to those from molecule‐specific computations. Point‐charge electrostatic potentials also agree favorably with those from charge‐density studies on the basis of X‐ray experiments, without requiring the considerable effort of the latter.
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