title: Effect of superalkali substituents on the strengths and properties of hydrogen and halogen bonds.
abstract: Quantum chemical calculations have been performed for the complexes Li(3)OCCX-Y (X = Cl, Br, H; Y = NH(3), H(2)O, H(2)S) and Li(3)OCN-X'Y' (X'Y' = ClF, BrCl, BrF, HF) to study the role of superalkalis in hydrogen and halogen bonds. The results show that the presence of an Li(3)O cluster in a Lewis acid weakens its acidity, while its presence in a Lewis base enhances its basicity. Furthermore, the latter effect is more prominent than the former one, and the presence of an Na(3)O cluster causes an even greater effect than Li(3)O. The strengths of hydrogen and halogen bonds were analyzed using molecular electrostatic potentials. The contributions of superalkalis to the strength of hydrogen and halogen bonds were elucidated by analyzing differences in electron density.
authors.affiliation: The Laboratory of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Yantai University, Yantai, 264005 People's Republic of China.
authors.forename: Wenkai
authors.initials: W
authors.lastname: Tian
authors.forename: Xin
authors.initials: X
authors.lastname: Huang
authors.forename: Qingzhong
authors.initials: Q
authors.lastname: Li
authors.forename: Wenzuo
authors.initials: W
authors.lastname: Li
authors.forename: Jianbo
authors.initials: J
authors.lastname: Cheng
authors.forename: Baoan
authors.initials: B
authors.lastname: Gong