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XeO_3和XeOF_2与三种不同杂化方式N原子的Xe\cdotsN非共价作用的理论研究

Theoretical Study on Xe\cdotsN non-Covalent Interactions: Three Hybridization N with XeO_3 and XeOF_2

  • 摘要: 本文采用密度泛函理论和二级微扰理论方法研究了XeO_3和XeOF_2与一系列不同杂化含氮给体配合物之间的相互作用. 含氮给体与XeO_3和XeOF_2之间的相互作用能在6.5\sim19.9 kcal/mol之间. 相互作用强弱顺序为sp^3>sp^2>sp,且XeO_3比XeOF_2高. 约化密度梯度图证明,对于sp^2和sp^3杂化的给体,空间位阻效应在相互作用中起着一定的影响. 能量成分分析发现,Xe\cdotsN作用主要的吸引部分是静电相互作用. 在XeO_3配合物中,极化能的占比大于色散,而在XeOF_2配合物中则相反. 除表面静电势(V_\mathrms)外,其他5个相互作用参数之间的线性相关系数均较大.

     

    Abstract: The interactions of complexes of XeOF_2 and XeO_3 with a series of different hybridization N-containing donors are studied by means of DFT and MP2 calculations. The aerogen bonding interaction energies range from 6.5 kcal/mol to 19.9 kcal/mol between XeO_3 or XeOF_2 and typical N-containing donors. The sequence of interaction for N-containing hybridization is sp^3>sp^2>sp, and XeO_3 is higher than XeOF_2. For some donors of sp^2 and sp^3 hybridization, the steric effect plays a minor role in the interaction with the evidence of reduced density gradient plots. The dominant stable part is the electrostatic interaction. In complex of XeO_3, the weight of polarization is larger than dispersion, while the situation is opposite for XeOF_2 complexes. Except for the sum of the maximum value of molecular electrostatic potential on Xe atom and minimum value of molecular electrostatic potential on N atom, the other five interaction parameters including the potential energy density at bond critical point, the equilibrium distances, interaction energies with the basis set superposition error correction, localized molecular orbital energy decomposition analysis interaction energies, and the electron charge density, show great linear correlation coefficients with each other.

     

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