期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 113, 期 52, 页码 14741-14748出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp904852x
关键词
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资金
- Ministerio de Educacion y Ciencia (Spain) [CTQ2007-61109]
- Ministerio de Ciencia e Innovacion (Spain) [PR2008-0251]
- Italian Ministry of University and Research (MIUR)
The present investigation on some ternary M+-benzene-X- aggregates follows previous Studies concerning the binary, M+-benzene (M = Li, Na, K, Rb, Cs) and X--benzene (X = F, Cl, Br, I), systems. A semimepirical model describing the intermolecular potential energy, formulated as a combination of few leading effective components, is here extended and applied to investigate more complex systems. The balancing of size repulsion with induction and dispersion attraction is described as a combination of ion-bond interactions and an electrostatic component, rationalized on the basis of the benzene quadrupole moment, is also included. For M+-benzene-X- aggregates, the simultaneous presence of a cation and an anion close to the pi system originates a strong Coulombic attraction and nonadditivity effects of the induction energy, which are carefully considered and explicitly included to obtain a proper analytical functional representation of the ternary compound. The proposed semiempirical methodology, providing the whole potential energy surface in a convenient analytical form, is useful to predict the main features of stable and unstable configurations, saddle points, and energy barriers, allowing for investigation of their influence on molecular dynamics simulations.
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