Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (08): 1175-1182.DOI: 10.6023/A13030332 Previous Articles     Next Articles

Article

PH2X与五元杂环体系磷键相互作用的理论研究

许惠英a, 王维b, 邹建卫c   

  1. a 浙江树人大学生物与环境工程学院 杭州 310015;
    b 镇海环境监测站 宁波 315200;
    c 浙江大学宁波理工学院 宁波 315104
  • 收稿日期:2013-03-25 出版日期:2013-08-14 发布日期:2013-05-06
  • 通讯作者: 许惠英, E-mail: xuhy65@163.com E-mail:xuhy65@163.com
  • 基金资助:

    项目受国家自然科学基金(No. 21272211)和浙江省自然科学基金(No. LY12B07013)资助.

Theoretical Study of Pnicogen Bonding Interactions between PH2X and Five-membered Heterocycles

Xu Huiyinga, Wang Weib, Zou Jianweic   

  1. a College of Biology & Environment Engineering, Zhejiang Shuren University, Hangzhou 310015;
    b Zhenhai Environmental Monitoring Station, Ningbo 315200;
    c Ningbo Institute of Technology, Zhejiang University, Ningbo 315104
  • Received:2013-03-25 Online:2013-08-14 Published:2013-05-06
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 21272211) and the Zhejiang Provincial Natural Science Foundation (No. LY12B07013).

Intermolecular interactions between PH2X (X=H, F, Cl, Br) and five-member heterocyclic compounds (pyrrole, furan, thiophene) were calculated by using MP2/aug-cc-pVDZ quantum chemical method, and the interaction energies were corrected with BSSE (basis set superposition error) by complete counterpoise correction method. On the basis of MP2/aug-cc-pVDZ optimized geometries, the second-order perturbation stabilization energies (ΔE2) and AIM properties were calculated using the NBO (natural bond orbital) program in Gaussian 03 and AIM 2000 program, respectively. In order to further understand this type of interaction, graphical analyses for representative systems were performed using the reduced density gradient (RDG) color-filled isosurface map and the electronic density difference map. It has been showed that the P—H…π hydrogen bonding interaction is formed between PH3 and three five-member heterocyclic compounds, and the pnicogen bonding interactions between PH2X (X=F, Cl, Br) and five-member heterocyclic compounds. There exist two types of pnicogen bonding interactions (π- and n-types) in these complexes, and the stabilities of the π-type pnicogen bonded complexes are stronger than those of the n-type ones. Moreover, the interaction energies have been found to correlate closely with the angle between P—X vector and the direction vector of P atom to the heterocyclic centroid. For comparison, intermolecular interactions between PCl3 and the three kinds of heterocyclic compounds were also studied. It has been showed that three positive electrostatic potential areas (or “σ-hole”) are presented at phosphorus atom end along the Cl—P bond in PCl3 molecule, so the complexes with multi-pnicogen-bonding can be formed between PCl3 and the heterocyclic compounds. Through atom in molecule (AIM) analysis, it has been disclosed that the nature of all the pnicogen bonding interactions belongs to the closed-shell electrostatic interactions, and the stabilities of the complexes are correlated positively with the electron densities in the bond critical points (BCPs). RDG graphical analyses are performed to visualize the positions and strengths of the pnicogen bonding. DDF analyses are also done, and indicating that electron density is reduced at phosphorus atom end and increased around the P—X axis and five-member heterocyclic molecule because of the pnicogen bonding inte-raction, thus the underlying rearrangement of the electron densities is intuitively reflected.

Key words: pnicogen bonding, NBO, AIM, RDG isosurface map, electronic density difference