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[求助]
請教分子中negative charge的計算
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各位大俠,大家好。 在本版學習很久,對Gaussian有一點點了解,但是本人不是做計算的。以下是我看文獻中遇到的一點小問題,特此請教,希望大家多多指點。 原文: “A density functional theory calculation [B3LYP/6-31G(d,p) level] indicated that the negative charge on C1 carbon of 1-ethynylbenzene is −0 .534 and that of 1-hexyne is −0. 461.” 大意:通過對苯乙炔和1-己炔的DFT計算得到端炔C的負電荷的數值。目的是解釋芳香端炔和脂肪端炔的親核性差別。 計算過程如下: “Calculation Method: The density functional theory calculations were carried out with the Gaussian 03 software. The ex-change-correlation functional we employed is dubbed Becke, three-parameter, L ee-Yang-Parr (B3LYP), which includes a fraction of Hartree–Fock exchange to reduce the self-interac-tion error. In this study, the 6-31G(d,p) basis sets were used. After we fully optimized the structure of each compound, we obtained its total energy. For each reaction, the stationary structures were obtained by optimizing the complex structures along the intrinsic reaction coordinate of the reaction pathway.“ 結論和計算過程基本都看得懂,但是在優(yōu)化結構之后得到total energy,怎樣讀出負電荷的數據?如果沒理解錯的話,計算的炔烴分子本身是中性的吧? 是不是與分子的靜電電勢圖有關系? 不知有沒有說清楚。。。求教! |


木蟲 (正式寫手)


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