Acidity in DMSO from the embedded cluster integral equation quantum solvation model

Acidity in DMSO from the embedded cluster integral equation quantum solvation model
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来自嵌入簇积分方程量子溶剂化模型的 DMSO 中的酸度

DOI:
10.1007/s00894-014-2161-4
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发表时间:
2014
影响因子:
2.2
通讯作者:
Egbers
Egbers
中科院分区:
化学4区
文献类型:
--
作者:
Tomazic;Egbers

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将嵌入式簇参考相互作用位点模型(EC-RISM)应用于二甲亚砜(DMSO)溶液中有机分子酸度常数的预测。EC-RISM是基于对溶质电子结构和溶剂结构的自一致处理,通过将量子化学计算与三维RISM积分方程理论相结合。我们将现有的DMSO力场与使用极化连续体模型(PCM)获得的参考计算进行了比较。使用两种不同的方法来消除质子的贡献,对结果进行统计评估:线性回归模型和化合物对的pkashshift分析。适当的理论水平为积分方程的方法是基准。通过可视化溶剂位置分布函数并与水环境进行比较,进一步分析和说明了结果。图3-甲基苯酚周围DMSO的解析位点分布及EC-RISM量子溶剂化模型的pkregression结果
The embedded cluster reference interaction site model (EC-RISM) is applied to the prediction of acidity constants of organic molecules in dimethyl sulfoxide (DMSO) solution. EC-RISM is based on a self-consistent treatment of the solute’s electronic structure and the solvent’s structure by coupling quantum-chemical calculations with three-dimensional (3D) RISM integral equation theory. We compare available DMSO force fields with reference calculations obtained using the polarizable continuum model (PCM). The results are evaluated statistically using two different approaches to eliminating the proton contribution: a linear regression model and an analysis of pKashifts for compound pairs. Suitable levels of theory for the integral equation methodology are benchmarked. The results are further analyzed and illustrated by visualizing solvent site distribution functions and comparing them with an aqueous environment.FigureSolvent site distribution of DMSO around 3-methylphenole and pKaregression result for the EC-RISM quantum solvation model
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