Covalent intermolecular interaction of the nitric oxide dimer (NO)(2)

	Covalent intermolecular interaction of the nitric oxide dimer (NO)(2)
	Zhang, H.; G. L. Zheng; G. Lv; Y. Z. Geng and Q. Ji
	2015
发表期刊	Chinese Physics B
卷号	24 期号:9 页码:5
摘要	Covalent bonds arise from the overlap of the electronic clouds in the internucleus region, which is a pure quantum effect and cannot be obtained in any classical way. If the intermolecular interaction is of covalent character, the result from direct applications of classical simulation methods to the molecular system would be questionable. Here, we analyze the special intermolecular interaction between two NO molecules based on quantum chemical calculation. This weak intermolecular interaction, which is of covalent character, is responsible for the formation of the NO dimer, (NO)(2), in its most stable conformation, a cis conformation. The natural bond orbital (NBO) analysis gives an intuitive illustration of the formation of the dimer bonding and antibonding orbitals concomitant with the breaking of the pi bonds with bond order 0.5 of the monomers. The dimer bonding is counteracted by partially filling the antibonding dimer orbital and the repulsion between those fully or nearly fully occupied nonbonding dimer orbitals that make the dimer binding rather weak. The direct molecular mechanics (MM) calculation with the UFF force fields predicts a trans conformation as the most stable state, which contradicts the result of quantum mechanics (QM). The lesson from the investigation of this special system is that for the case where intermolecular interaction is of covalent character, a specific modification of the force fields of the molecular simulation method is necessary.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55516
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhang, H.,G. L. Zheng,G. Lv,et al. Covalent intermolecular interaction of the nitric oxide dimer (NO)(2)[J]. Chinese Physics B,2015,24(9):5.
APA	Zhang, H.,G. L. Zheng,G. Lv,&Y. Z. Geng and Q. Ji.(2015).Covalent intermolecular interaction of the nitric oxide dimer (NO)(2).Chinese Physics B,24(9),5.
MLA	Zhang, H.,et al."Covalent intermolecular interaction of the nitric oxide dimer (NO)(2)".Chinese Physics B 24.9(2015):5.

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