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首页> 外文期刊>Bulletin of the Chemical Society of Japan >New Generation of the Reference Interaction Site Model Self-Consistent Field Method: Introduction of Constrained Spatial Electron Density Distribution (cSED)
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New Generation of the Reference Interaction Site Model Self-Consistent Field Method: Introduction of Constrained Spatial Electron Density Distribution (cSED)

机译:新一代参考交互站点模型自一致的现场方法:引入受限空间电子密度分布(CSED)

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摘要

Quantum mechanical (QM) calculation in solution is becoming a popular and useful tool in chemistry. We have developed a hybrid method between QM and reference interaction site model (RISM). To combine RISM with QM calculations, we have to employ charge fitting approaches. By introducing constrained spatial electron density distribution (cSED) in the fitting, we developed a new generation of RISM self-consistent field (SCF). Our method (RISM-SCF-cSED) overcame the instability of the original RISM-SCF calculations. We extended RISM-SCF-cSED by coupling a variety of QM approaches. We applied our method to tautomerization reactions of cytosine, 6-chloro-2-pyridone, and isonicotinic acid in water and Stokes shift calculation of indole and 5-cyanoindole. Our method correctly evaluated relative free energy differences in the reaction and the Stokes shift change along the polarity of solvent.
机译:溶液中量子机械(QM)计算正在成为化学中的流行且有用的工具。 我们在QM和参考交互站点模型(Risc)之间开发了一种混合方法。 将Rism与QM计算结合起来,我们必须采用充电拟合方法。 通过在拟合中引入受限的空间电子密度分布(CSED),我们开发了新一代Risc自我一致的领域(SCF)。 我们的方法(Rism-SCF-CSED)克服了原始Rism-SCF计算的不稳定性。 我们通过耦合各种QM方法扩展了Rism-SCF-CSED。 我们将我们的方法应用于胞嘧啶,6-氯-2-吡啶酮和异烟酸在水中的互变化反应,并促进吲哚和5-氰基吲哚的转移计算。 我们的方法在反应中正确评估了相对的自由能差,并且沿溶剂的极性变化的斯托克斯变化。

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