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
中科院分区:
文献类型:
--
作者:
Truchon,Jean-Francois;Nicholls,Anthony;Iftimie,RaduI;Roux,Benoit;Bayly,ChristopherI
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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DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
D. Rotella;Sunday Morning
通讯作者:
Sunday Morning
影响因子:
56.9
作者:
Roux, B;MacKinnon, R
通讯作者:
MacKinnon, R
影响因子:
2.9
作者:
Kaminski, GA;Stern, HA;Friesner, RA
通讯作者:
Friesner, RA
影响因子:
3.3
作者:
Noskov, SY;Lamoureux, G;Roux, B
通讯作者:
Roux, B
影响因子:
3
作者:
K. Rankin;T. Sulea;E. Purisima
通讯作者:
E. Purisima