title: The enhancing effects of group V σ-hole interactions on the F···O halogen bond.
abstract: The σ-hole interaction, which occurs between the covalent IV-VII atoms and nucleophilic substances, has become a hot issue of weak interaction. In this work, NCF···O=PX3···(NCF)n (X = F, Cl, Br, H, CH3·; n = 0, 1, 2) complexes were constructed and studied based on the second-order Møller-Plesset perturbation theory (MP2) calculations to investigate the enhancing effects of group V σ-hole interactions on the F···O halogen bond. With increasing n, the FO halogen bond becomes stronger, indicating that the group V σ-hole interactions could enhance the F···O halogen bond. As the capacity of donating electrons of X increases, the most negative electrostatic potentials outside the oxygen atom of O=PX3···(NCF)n (n = 0, 1, 2) become more negative, resulting in a stronger F···O halogen bond. In the formation of a F···O halogen bond, along the sequence of X = F, Cl, Br, H, CH3 of the negative sites O=PX3, the electric field of the lone pair of oxygen becomes greater and causes a larger decrease in electron density outside the fluorine atom. On the other hand, with increasing n from 0 to 2, the group V σ-hole interactions also increase the electric field of lone pair of oxygen and results in a larger decrease in electron density outside the fluorine atom.
authors.affiliation: Institute of Computational Quantum Chemistry, College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, P. R. China. yanlizengs@163.com menglp@hebtu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Yanli
authors.initials: Y
authors.lastname: Zeng
authors.forename: Xueying
authors.initials: X
authors.lastname: Zhang
authors.forename: Shijun
authors.initials: S
authors.lastname: Zheng
authors.forename: Lingpeng
authors.initials: L
authors.lastname: Meng
mesh_terms: D002244:Carbon / Q000737:chemistry*; D005461:Fluorine / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D055672:Static Electricity
chemical_list: D010758:Phosphorus; D005461:Fluorine; D002244:Carbon; D009584:Nitrogen; D010100:Oxygen