Journal article


Ab initio models for six-center multiple proton exchange and ion pair formation assisted by Lewis acids


Publication Details
Author(s): van Eikema Hommes N, Heidrich D, Schleyer P
Publisher: Springer Verlag (Germany)
Publication year: 2000
Volume: 6
Journal issue: 9
Pages range: 563-574
ISSN: 1610-2940

Abstract

High level ab initio and density functional calculations, extrapolated to QCISD(T)/6-311+ G(3df,2p)//MP2/6-31+G**+ZPE, reveal that cyclic ion pairs can form in the hydrogen bonded complexes of haloboric acids BHnX3-n-HX, X=F, Cl, with Lewis bases HX, H2O, CH3OH, and NH3, even in isolation (e.g., in the gas phase). The intrinsic acidities (deprotonation energies) required for protonation of these bases with formation of gas phase ion pairs are calculated to be <295 kcal/mol for water, <301 kcal/mol for methanol, and <306 kcal/mol for ammonia; such values are common for acidic sites in zeolites. All gas phase ion pairs prefer symmetric bidentate or tridentate structures. In the other cases where hydrogen bonded complexes prevail, symmetric ion pair-like transition structures for multiple hydrogen exchange are computed.



How to cite
APA: van Eikema Hommes, N., Heidrich, D., & Schleyer, P. (2000). Ab initio models for six-center multiple proton exchange and ion pair formation assisted by Lewis acids. Journal of Molecular Modeling, 6(9), 563-574.

MLA: van Eikema Hommes, Nico, Dietmar Heidrich, and Paul Schleyer. "Ab initio models for six-center multiple proton exchange and ion pair formation assisted by Lewis acids." Journal of Molecular Modeling 6.9 (2000): 563-574.

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