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Bond paths show preferable interactions: Ab initio and QTAIM studies on the X-H?π hydrogen bond

机译:键路径显示出较好的相互作用:从头算和QTAIM研究X-H?π氢键

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摘要

MP2/6-311++G(d,p) calculations on complexes of C_4H_4, C_5H_5~-, and C_6H_6, acting as Lewis bases, and C_2H_2 and HF species, being Lewis acids, were carried out. Additionally the calculations were performed on C _3H_3~+?C_2H_2 and C_3H_3~+?HF complexes. For the latter complexes, HF and C_2H_2 molecules are Lewis bases while C_3H_3~+ ion is the Lewis acid. All systems were optimized, and no imaginary frequencies were found, showing that the complexes analyzed are energetic minima. The quantum theory of "atoms in molecules" (QTAIM) was also applied to analyze occurring interactions. The X-H?π hydrogen bonds were found for complexes, except of those where C_3H_3~+ ion acts as the Lewis acid. QTAIM shows that for all systems analyzed the bond paths correspond to preferable interactions.
机译:对作为路易斯碱的C_4H_4,C_5H_5〜-和C_6H_6的配合物以及路易斯酸C_2H_2和HF的配合物进行了MP2 / 6-311 ++ G(d,p)计算。另外,对C _3H_3〜+αC_2H_2和C_3H_3〜+αHF络合物进行了计算。对于后者的络合物​​,HF和C_2H_2分子是路易斯碱,而C_3H_3〜+离子是路易斯酸。所有系统都进行了优化,没有发现任何假想的频率,表明所分析的络合物是能量极小值。 “分子中的原子”(QTAIM)的量子理论也被用于分析发生的相互作用。除C_3H_3〜+离子为路易斯酸的配合物外,还发现了配合物的X-H?π氢键。 QTAIM显示,对于所有已分析的系统,键路径对应于较好的相互作用。

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