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Calculations of pK_a of superacids in 1,2-dichloroethane

机译:1,2-二氯乙烷中超酸的pK_a的计算

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摘要

Acidity calculations for some CH and NH superacids in 1,2-dichloroethane (DCE) were carried out using SMD and COSMO-RS continuum solvation models. After comparing the results of calculations with respective experimental pK _a values it was found that the performance of SMD/M05-2X/6-31G* method is characterized by the mean unsigned error (MUE) of 0.5 pK_a units and the slope of regression line of 0.915. The similar SMD/B3LYP/6-31G* approach was slightly less successful. The strong correlation over entire data set is confirmed by R~2 values of 0.990 and 0.984 for M05-2X and B3LYP functionals, respectively. The COSMO-RS method, while providing the value of the linear regression line slope similar to the corresponding values from SMD approach, characterized by rather loose correlation (R~2 = 0.823, MUE = 1.7 pK_a units) between calculated and experimental pK_a values in DCE solution.
机译:使用SMD和COSMO-RS连续溶剂化模型对1,2-二氯乙烷(DCE)中某些CH和NH超酸的酸度进行了计算。在将计算结果与各个实验pK _a值进行比较后,发现SMD / M05-2X / 6-31G *方法的性能以0.5 pK_a单位的平均无符号误差(MUE)和回归线的斜率为特征为0.915。相似的SMD / B3LYP / 6-31G *方法不太成功。 M05-2X和B3LYP功能的R〜2值分别为0.990和0.984,证实了整个数据集的强相关性。 COSMO-RS方法提供的线性回归线斜率值与SMD方法的相应值相似,但其特征在于,计算出的和实验中的pK_a值之间存在相当宽松的相关性(R〜2 = 0.823,MUE = 1.7 pK_a单位)。 DCE解决方案。

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