XH-NH3(X=F,Cl,Br)质子传递的溶剂效应:簇模型,连续介质模型和离散-连续组合模型的比较

化学学报 ›› 2004, Vol. 62 ›› Issue (18): 1683-1688. 上一篇下一篇

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XH-NH₃(X=F,Cl,Br)质子传递的溶剂效应:簇模型,连续介质模型和离散-连续组合模型的比较

曹志霁¹, 莫亦荣^1,2, 林梦海¹, 张乾二¹

1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 理论化学研究中心, 厦门, 361005;
2. Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008

投稿日期:2004-04-20 修回日期:2004-05-27 发布日期:2014-02-17
通讯作者: 林梦海,E-mail:linmh@xmu.edu.cn E-mail:linmh@xmu.edu.cn
基金资助:
国家自然科学基金(Nos.90206038,20373053)和福建省重大项目基金(No.2002F010)资助项目.

Solvent Effect on Proton Transfer in Ammonia-hydrogen Halide Complexes: Comparison of Cluster, Continuum and Combined Discrete-continuum Models

CAO Zhi-Jia¹, MO Yi-Rong^1,2, LIN Meng-Hai¹, ZHANG Qian-Er¹

1. Department of Chemistry, State Key Loboratory for Physical Chemistry of Solid Surfaces, Center for Theoretical Chemistry, Xiamen University, Xiamen 361005, China;
2. Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA

Received:2004-04-20 Revised:2004-05-27 Published:2014-02-17

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摘要/Abstract

分别采用分子簇模型、连续介质模型和离散-连续组合模型研究了XH-NH₃(X=F,Cl,Br)分子内质子传递的溶剂效应.结果表明,对于弱酸性化合物FH-NH₃,其溶剂效应主要为短程作用,3个H₂O分子即可使其发生质子传递,而简单的连续介质模型得到的仍为分子化合物形式,需进一步包含溶剂效应短程作用.对于强酸性化合物ClH-NH₃和BrH-NH₃,较弱的溶剂效应即可促使其发生质子传递,分子簇模型和连续介质模型均可合理描述,且与离散-连续组合模型的结果相近.离散-连续组合模型既在从头算水平考虑了溶质分子和第一溶剂化层中溶剂分子间的短程作用,又包含了溶剂效应的长程静电作用,能更准确地描述溶剂化作用,且对弱酸性化合物和强酸性化合物体系均适用.

关键词: XH-NH₃(X=F, Cl, Br), 质子传递, 溶剂效应, 簇模型, 连续介质模型, 离散-连续组合模型

Solvent effects on proton transfer in ammonia-hydrogen halide complexes have been investigated by using the cluster, continuum, and combined discrete-continuum models, respectively. Our results show that for the hydrogen-bonded complexes with less acidic HF subunit, the structure obtained by the continuum model is of neutral type whereas in clusters with at least three molecules of water the ion pair structures have been found. These results suggest that for such hydrogen bonded complex the simple continuum model is not adequate and explicit water molecules should be added in order to take into account specific hydrogen bonds. For the hydrogen-bonded complexes with strong acidic HCl and HBr subunits, a weak solvent effect is adequate to describe proton transfer processes in aqueous solution. The ion pair structures have been found by using the cluster model or the continuum model, and their results are in agreement with those in the combined discrete-continuum model. Because specific solute-solvent interactions were described at the quantum level and long-range interactions were introduced through a continuum model, the combined discrete-continuum model would lead to more accurate solvation properties and was suitable for hydrogen-bonded complexes with both strongly and weakly acidic HX subunit.

Key words: XH-NH₃(X=F,Cl,Br), proton transfer, solvent effect, cluster model, continuum model, combined discrete-continuum model

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曹志霁, 莫亦荣, 林梦海, 张乾二. XH-NH₃(X=F,Cl,Br)质子传递的溶剂效应:簇模型,连续介质模型和离散-连续组合模型的比较[J]. 化学学报, 2004, 62(18): 1683-1688.

CAO Zhi-Jia, MO Yi-Rong, LIN Meng-Hai, ZHANG Qian-Er. Solvent Effect on Proton Transfer in Ammonia-hydrogen Halide Complexes: Comparison of Cluster, Continuum and Combined Discrete-continuum Models[J]. Acta Chimica Sinica, 2004, 62(18): 1683-1688.

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XH-NH₃(X=F,Cl,Br)质子传递的溶剂效应:簇模型,连续介质模型和离散-连续组合模型的比较

Solvent Effect on Proton Transfer in Ammonia-hydrogen Halide Complexes: Comparison of Cluster, Continuum and Combined Discrete-continuum Models

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