title: The prominent enhancing effect of the cation-π interaction on the halogen-hydride halogen bond in M1⋅⋅⋅C6H5X⋅⋅⋅HM2.
abstract: We designed M(1)⋅⋅⋅C(6)H(5)X⋅⋅⋅HM(2) (M(1) =Li(+), Na(+); X=Cl, Br; M(2) =Li, Na, BeH, MgH) complexes to enhance halogen-hydride halogen bonding with a cation-π interaction. The interaction strength has been estimated mainly in terms of the binding distance and the interaction energy. The results show that halogen-hydride halogen bonding is strengthened greatly by a cation-π interaction. The interaction energy in the triads is two to six times as much as that in the dyads. The largest interaction energy is -8.31 kcal mol(-1) for the halogen bond in the Li(+)⋅⋅⋅C(6)H(5)Br⋅⋅⋅HNa complex. The nature of the cation, the halogen donor, and the metal hydride influence the nature of the halogen bond. The enhancement effect of Li(+) on the halogen bond is larger than that of Na(+). The halogen bond in the Cl donor has a greater enhancement than that in the Br one. The metal hydride imposes its effect in the order HBeH<HMgH<HNa<HLi for the Cl complex and HBeH<HMgH<HLi<HNa for the Br complex. The large cooperative energy indicates that there is a strong interplay between the halogen-hydride halogen bonding and the cation-π interaction. Natural bond orbital and energy decomposition analyses indicate that the electrostatic interaction plays a dominate role in enhancing halogen bonding by a cation-π interaction.
authors.affiliation: The Laboratory of Theoretical and Computational Chemistry, Science and Engineering College of Chemistry and Biology, Yantai University, Yantai, P R China.
authors.forename: Ran
authors.initials: R
authors.lastname: Li
authors.forename: Qingzhong
authors.initials: Q
authors.lastname: Li
authors.forename: Jianbo
authors.initials: J
authors.lastname: Cheng
authors.forename: Zhenbo
authors.initials: Z
authors.lastname: Liu
authors.forename: Wenzuo
authors.initials: W
authors.lastname: Li
mesh_terms: D002412:Cations / Q000737:chemistry; D002627:Chemistry, Physical; D004583:Electrons; D006219:Halogens / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D058116:Lewis Acids / Q000737:chemistry*; D058115:Lewis Bases / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D008958:Models, Molecular; D008962:Models, Theoretical; D011789:Quantum Theory; D013816:Thermodynamics
chemical_list: D002412:Cations; D006219:Halogens; D058116:Lewis Acids; D058115:Lewis Bases; D008670:Metals; D006859:Hydrogen