Accurate Molecular Polarizabilities Based on Continuum Electrostatics.

Accurate Molecular Polarizabilities Based on Continuum Electrostatics.
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基于连续静电学的精确分子极化率。

DOI:
10.1021/ct800123c
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发表时间:
2008
影响因子:
5.5
通讯作者:
Bayly,ChristopherI
Bayly,ChristopherI
中科院分区:
化学1区
文献类型:
--
作者:
Truchon,Jean-Francois;Nicholls,Anthony;Iftimie,RaduI;Roux,Benoit;Bayly,ChristopherI

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介绍了一种新的方法来表示作为连续介质的分子内极化率来考虑分子的电子极化。它示出,使用有限差分求解泊松方程,电子极化从内部连续(EPIC)模型产生准确的气相分子极化率张量的测试集的98个具有挑战性的分子组成的杂芳族化合物,烷烃,和芳香族化合物。电子极化起源于高分子内电介质,其产生的极化率与B3 LYP/aug-cc-pVTZ和实验值一致时,由真空电介质包围。与其他方法来模拟电子极化,这个简单的模型避免了极化率灾难,并准确地计算分子的各向异性与使用非常少的拟合参数,而不诉诸辅助网站或各向异性原子中心。平均而言,与B3 LYP相比,平均极化率和各向异性的无符号误差分别为2%和5%。从B3 LYP和这种方法的极化率分量之间的相关性导致aR 2为0.990和0.999的斜率。即使是F2各向异性,被证明是一个困难的情况下,现有的极化率模型,可以重现在2%的误差。除了提供新的参数的快速方法直接适用于计算的极化率,这项工作扩展了广泛使用的泊松方程的准确的分子极化率问题的领域。
A novel approach for representing the intramolecular polarizability as a continuum dielectric is introduced to account for molecular electronic polarization. It is shown, using a finite-difference solution to the Poisson equation, that the electronic polarization from internal continuum (EPIC) model yields accurate gas-phase molecular polarizability tensors for a test set of 98 challenging molecules composed of heteroaromatics, alkanes, and diatomics. The electronic polarization originates from a high intramolecular dielectric that produces polarizabilities consistent with B3LYP/aug-cc-pVTZ and experimental values when surrounded by vacuum dielectric. In contrast to other approaches to model electronic polarization, this simple model avoids the polarizability catastrophe and accurately calculates molecular anisotropy with the use of very few fitted parameters and without resorting to auxiliary sites or anisotropic atomic centers. On average, the unsigned error in the average polarizability and anisotropy compared to B3LYP are 2% and 5%, respectively. The correlation between the polarizability components from B3LYP and this approach lead to aR2of 0.990 and a slope of 0.999. Even the F2anisotropy, shown to be a difficult case for existing polarizability models, can be reproduced within 2% error. In addition to providing new parameters for a rapid method directly applicable to the calculation of polarizabilities, this work extends the widely used Poisson equation to areas where accurate molecular polarizabilities matter.
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