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Role of Dynamical Electron Correlation in the Differences in Bonding between CaAlH3 and MgAlH3

机译:动态电子相关在Caalh3和MgalH3之间粘合差异中的作用

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摘要

The most important factor behind the intriguing differences between the geometries of the M'AlH3 (M' = Mg, Ca) molecules is shown to be dynamical electron correlation and not intramolecular Coulombic interactions, as previously thought. Spin-coupled generalized valence bond (SCGVB) calculations reveal the different bonding situations in the two molecules at their optimal geometries but do not explain why these geometries differ so much; the solution to this conundrum comes instead from detailed analysis of coupled-cluster (CCSD(T)) energies at model and optimal geometries.
机译:在M’AlH3(M’=Mg,Ca)分子的几何结构之间的有趣差异背后,最重要的因素是动态电子关联,而不是如之前所认为的分子内库仑相互作用。自旋耦合广义价键(SCGVB)计算揭示了两个分子在最佳几何构型下的不同成键情况,但没有解释这些几何构型差异如此之大的原因;解决这个难题的办法是在模型和最佳几何结构下对耦合团簇(CCSD(T))能量进行详细分析。

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