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三卤化硼Lewis酸性的密度泛函理论研究
Lewis Acidity of Boron Trihalide: with Density Functional Theory Study
【摘要】 用密度泛函理论的 DFT-LDA/NL方法研究 BX3( X=F,Cl,Br)分子的 Lewis酸性 .计算 BX3分子的硬度时 ,采用一个可供选择的方法 .该法是密度泛函理论的 Janak定理的推广 .结果表明 ,分子硬度是 BX3Lewis酸性的最好表征 .应用 Pearson的软硬酸碱 ( HSAB)原理可以合理地解释 BX3酸性的变化规律
【Abstract】 Density functional theoretical calculations on BX 3 (X=F, Cl, Br) have been carried out at LDA/NL levels in order to interpret the experimental Lewis acidity scale for these molecules studied. An alternative calculation method for chemical hardness, based on the Janak′s extension of density functional theory for fractional occupancies, is employed in the study of the Lewis acidity of boron trihalide. It is shown that the acidity of boron trihalide can be understood in term of the hardness. The molecular hardness calculated from the valence orbital hardness is found to be the best characteristic for the Lewis acidity of boron trihalide.
【Key words】 Boron trihalide; Lewis acidity; Density functional theory; Molecular hardness;
- 【文献出处】 高等学校化学学报 ,Chemical Research In Chinese Universities , 编辑部邮箱 ,2001年07期
- 【分类号】O641.1
- 【被引频次】3
- 【下载频次】178