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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Structures and Binding Energies of Proton-Bound Pairs of HCN and CH_3CN with HN_3, H_2O, HF, CH_3NH_2, CH_3OH, and CH_3F
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Structures and Binding Energies of Proton-Bound Pairs of HCN and CH_3CN with HN_3, H_2O, HF, CH_3NH_2, CH_3OH, and CH_3F

机译:HCN和CH_3CN与HN_3,H_2O,HF,CH_3NH_2,CH_3OH和CH_3F的质子束缚对的结构和结合能

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摘要

In this study, 12 nitrile-containing proton-bound dimers were investigated with ab initio molecular orbital calculations: (HCN)(NH_3)H~+, (HCN)(HF)H~+, (HCN)(HF)H~+, (HCN)(CH_3NH_2)H~+, (HCN)(CH_3OH)H~+, (HCN)(CH_3F)H~+, (CH_3CN)(NH_3)H~+, (CH_3CN)(H_2O)H~+, (CH_3CN)(HF)H~+, (CH_3CN)(CH_3NH_2)H~+, (CH_3CN)(CH_3OH)H~+, and (CH_3CN)(CH_3F)H~+. The geometries of these dimers were optimized at the MP2/6-31+G(d) level of theory, and their binding energies (relative to the lowest energy dissociation products) were calculated with the G2, G2(ZPE=MP2), G2(MP2), and G2(MP2, SVP) methods. The trends in the binding energies follow the absolute value of the difference in proton affinity of the constituent monomers; the larger the PA difference, the smaller the binding energy. An empirical relationship has been derived that may prove useful in predicting the binding energies of other nitrile-containing cluster ions. The results are compared to experimental values where available.
机译:在这项研究中,从头开始进行分子轨道计算,研究了12个含腈的质子结合二聚体:(HCN)(NH_3)H〜+,(HCN)(HF)H〜+,(HCN)(HF)H〜+ ,(HCN)(CH_3NH_2)H〜+,(HCN)(CH_3OH)H〜+,(HCN)(CH_3F)H〜+,(CH_3CN)(NH_3)H〜+,(CH_3CN)(H_2O)H〜+ ,(CH_3CN)(HF)H〜+,(CH_3CN)(CH_3NH_2)H〜+,(CH_3CN)(CH_3OH)H〜+和(CH_3CN)(CH_3F)H〜+。在MP2 / 6-31 + G(d)的理论水平上优化了这些二聚体的几何结构,并用G2,G2(ZPE = MP2),G2计算了它们的结合能(相对于最低的能量离解产物) (MP2)和G2(MP2,SVP)方法。结合能的趋势遵循构成单体的质子亲和力之差的绝对值。 PA差越大,结合能越小。已经得出了一种经验关系,该关系可能被证明对预测其他含腈簇离子的结合能很有用。将结果与可用的实验值进行比较。

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