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Theoretical Study on the Complexes of Benzene with Isoelectronic Nitrogen-Containing Heterocycles

机译:苯与等电氮杂环配合物的理论研究

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摘要

The π–π interactions between benzene and the aromatic nitrogen heterocycles pyridine, pyrimidine, 1,3,5-triazine, 1,2,3-triazine, 1,2,4,5-tetrazine, and 1,2,3,4,5-pentazine are systematically investigated. The T-shaped structures of all complexes studied exhibit a contraction of the C—H bond accompanied by a rather large blue shift (40–52 cm−1) of its stretching frequency, and they are almost isoenergetic with the corresponding displaced-parallel structures at reliable levels of theory. With increasing number of nitrogen atoms in the heterocycle, the geometries, frequencies, energies, percentage of s character at C, and the electron density in the C—H σ antibonding orbital of the complexes all increase or decrease systematically. Decomposition analysis of the total binding energy showed that for all the complexes, the dispersion energy is the dominant attractive contribution, and a rather large attraction originating from electrostatic contribution is compensated by its exchange counterpart.
机译:苯与芳香氮杂环吡啶,嘧啶,1,3,5-三嗪,1,2,3-三嗪,1,2,4,5-四嗪和1,2,3,4之间的π-π相互作用,系统地研究了5-5-戊嗪。研究的所有复合物的T形结构均显示出CH键的收缩,并伴随着其拉伸频率的较大蓝移(40–52 cm −1 ),并且几乎是等能量的在可靠的理论水平上具有相应的平行位移结构。随着杂环中氮原子数目的增加,配合物的几何形状,频率,能量,C处的s性质百分比以及CH-Hσ反键轨道中的电子密度都系统地增加或减少。对总结合能的分解分析表明,对于所有配合物,分散能是主要的吸引力贡献,而来自静电贡献的相当大的吸引力被其交换对应物所补偿。

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