高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (8): 1406.doi: 10.7503/cjcu20170039

• 物理化学 • 上一篇    下一篇

金属碳,卡宾阳离子[M-X]+(M=Au,Ag,Cu;X=C,CH2)与甲烷反应机制研究

孙小丽1, 孟令敏2, 金明星3, 李吉来1   

  1. 1. 吉林大学理论化学研究所, 长春 130023;
    2. 长春迪瑞医疗科技股份有限公司, 长春 130103;
    3. 吉林大学原子与分子物理研究所, 长春 130012
  • 收稿日期:2017-01-17 修回日期:2017-07-10 出版日期:2017-08-10 发布日期:2017-07-10
  • 通讯作者: 李吉来,男,博士,教授,博士生导师,主要从事重要化学过程微观机理研究.E-mail:jilai@jlu.edu.cn E-mail:jilai@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:21473070)和中国博士后科学基金(批准号:2016M591476)资助.

Mechanism Research of Reactions of Metal Carbides and Carbenes Cation[M-X] +(M=Au, Ag, Cu; X=C, CH2) with Methane

SUN Xiaoli1, MENG Lingmin2, JIN Mingxing3, LI Jilai1   

  1. 1. Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China;
    2. Dirui Industrial Co., Ltd, Changchun 130103, China;
    3. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
  • Received:2017-01-17 Revised:2017-07-10 Online:2017-08-10 Published:2017-07-10
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.21473070) and the Project of China Postdoctoral Science Foundation(No.2016M591476).

摘要:

在CCSD(T)-REL//B2GP-PLYP水平下构建[Au(CH2)]+与甲烷反应的可靠反应势能面,分析了C-H键活化过程中的几何结构变化情况;对反应IRC路径上关键点进行自然键轨道(NBO)电荷和分子轨道分析,从理论上推定该氢转移过程属于氢负离子(H-)转移.对[M-X]+(M=Au,Ag,Cu;X=C,CH2)与甲烷反应进行对比,分析了甲烷作为氢供体反应过程的内在影响因素.M-X键能和反应活性中心C上直接参与反应的低能轨道对反应活性均起重要作用,两者协同调控微观反应机制.

关键词: C-H键活化, 卡宾阳离子, 质子转移, 氢原子转移, 氢负离子转移

Abstract:

In this article, the reaction mechanism of the cation[Au(CH2)] + and methane was investigated at the CCSD(T)-REL//B2GP-PLYP level of theory initially. A detailed analysis of geometric structure changes during the C-H bond activation was given. As a major result, based on natural bond orbital(NBO) charge and molecular orbital analysis, a hydride transfer mechanistic scenario from methane to[Au(CH2)] + was identified unambiguously. Methane activation has been identified among its reaction with[M-X] +(M=Au, Ag, Cu; X=C, CH2). Analysis for the inherent factors during the reaction of methane as a hydrogen donor is given. The M-X bond energy and the low-lying vacant orbital directly involved in the reaction of the active center C play an important role on the reaction activity, and both mediated microscopic mechanism. This study may provide important guidance for the rational design of catalysts.

Key words: C-H Bond activation, Carbene cation, Proton transfer, Hydrogen atom transfer, Hydride transfer

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