高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (9): 2046.doi: 10.7503/cjcu20200291

• 物理化学 • 上一篇    下一篇

柱芳烃与烷烃间CH…π和CH…O的作用本质及协同性

孙涛, 王一波()   

  1. 贵州大学化学化工学院, 贵州省高性能计算化学重点实验室, 贵阳 550025
  • 收稿日期:2020-05-25 出版日期:2020-09-10 发布日期:2020-09-02
  • 通讯作者: 王一波 E-mail:ybw@gzu.edu.cn
  • 基金资助:
    国家自然科学基金(21767005);贵州省科技计划项目(批准号: 黔科合LH字[2017]7261号、 黔科合平台人才[2017]5788号)资助

Theoretical Study on the Nature and Cooperation of CH•••O and CH•••π Interactions in the Pillar[5]arene and n⁃Alkanes Complexes

SUN Tao, WANG Yibo()   

  1. College of Chemistry and Chemical Engineering, Guizhou Key Laboratory of High Performance Computational Chemistry, Guizhou University, Guiyang 550025, China
  • Received:2020-05-25 Online:2020-09-10 Published:2020-09-02
  • Contact: WANG Yibo E-mail:ybw@gzu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(21767005);the Science and Technology Plan Project of Guizhou Province, China(QianKeHe[2017]7261)

摘要:

以CCSD(T)/CBS方法的结合能计算结果为标准, 选择CAM-B3LYP-D3BJ/def2-SVPD密度泛函理论方法计算了甲氧基柱[5]芳烃(MeP5)与CnH2n+2(n=1~10, 12, 14, 16) 复合物的结合能, 结果表明, 它们之间存在强烈的相互作用, 且随着烷烃分子碳链的增长而增大; 热力学函数计算结果表明, 在298.15 K, 101325 Pa下, MeP5与CnH2n+2(n=3~10, 12, 14, 16)形成复合物的过程中, ΔG和ΔH均小于零, 是焓驱动的自发过程. 烷烃与MeP5之间C―H…π和C―H…O的协同作用是主客体复合物稳定化的起因, 用二代绝对局域分子轨道能量分解(ALMO-EDA)方法分析此协同作用, 发现其中静电作用和色散作用的贡献相近, 二者加和约占总吸引的94%, 极化能和电荷转移能仅占6%.

关键词: 柱[5]芳烃, 烷烃, C―H…π, C―H…O, 协同作用本质

Abstract:

Using the calculation result of the binding energy of the CCSD(T)/CBS method as the standard, the CAM-B3LYP-D3BJ/def2-SVPD density functional theory(DFT) method was chosed to calculate the bin- ding energy of the MeP5…CnH2n+2(n=1—10, 12, 14, 16) complexes. The results show that there is a strong interaction between the host and guest, and the binding energy increases with the growth of the alkane carbon chain. The Gibbs free energy and enthalpy change are both less than zero at standard conditions(nominally 298.15 K, 101325 Pa), which indicating that the formation of the complexes is spontaneous, and the main driving force associated with is enthalpy. The nature and cooperation of the C―H…π and C―H…O interactions between alkanes and dimethoxypillar[5]arene(MeP5) were explored using the absolutely localized molecular orbitals energy decomposition analysis(ALMO-EDA) method, and found that the sum of the electrostatic and dispersion effects accounts for about 94% of the total attraction, and their contribution is similar, with polarization and charge transfer accounting for only 6%.

Key words: Pillar[5]arene, Alkanes, C―H…π, C―H…O, Nature of cooperative interaction

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