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Dihydrogen Bonding: Donor–Acceptor Bonding (AH···HX) versus the H2 Molecule (AH2X)

机译:二氢键:供体-受体键(AH···HX)与H2分子(AH2X)

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Dihydrogen bonds (DHBs) play a role in, among others, crystal packing, organometallic reaction mechanisms, and potential hydrogen-storage materials. In this work we have analyzed the central HH bond in linear H4, LiH···HX, BH4···HX, and AlH4···HX complexes with various X by using the quantitative molecular orbital model contained in Kohn–Sham density functional theory at the BP86/ TZ2P level of theory. First, we address the questions of if and how one can distinguish, in principle, between a H···H donor–acceptor DHB and the formation of an H2 molecule by using the simple H4 model system. The results of these analyses have been used to gain an understanding of the bonding in more realistic model systems (some of which have been studied experimentally), and how this differs from the bonding in H4.
机译:二氢键(DHBs)尤其在晶体堆积,有机金属反应机理和潜在的储氢材料中起作用。在这项工作中,我们通过使用Kohn-Sham密度泛函中包含的定量分子轨道模型,分析了带有各种X的线性H4,LiH···HX,BH4··HX和AlH4···HX配合物中的中心HH键BP86 / TZ2P理论级别的理论。首先,我们通过简单的H4模型系统来解决以下问题:是否以及如何在原则上区分H··H供体-受体DHB和H2分子的形成。这些分析的结果已用于了解更现实的模型系统(其中一些已通过实验研究)中的键合,以及与H4中的键合有何不同。

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