Surface electrostatic potentials of halogenated methanes as indicators of directional intermolecular interactions

1992/03/14 by Tore Brinck, Jane S. Murray, Peter Politzer · 30 citations
Physics and Astronomy · Chemistry · Pharmacology, Toxicology and Pharmaceutics · #Advanced Chemical Physics Studies #Molecular Spectroscopy and Structure #Fluorine in Organic Chemistry

paper · doi:10.1002/qua.560440709

Abstract

Using an ab initio self-consistent-field molecular orbital approach, we have computed 6-31G*//STO-3G* electrostatic potentials for CH3F, CF4, CH3Cl, CCl4, CH3Br, and CBr4. It is demonstrated that the potentials along the carbon–halogen bonds of these systems can explain the observed directional preferences of the halogens' intermolecular interactions. Our surface potentials for the chlorinated and brominated molecules favor the observed “side-on” and “head-on” interactions with electrophiles and nucleophiles, respectively, of CCl and CBr in crystals, whereas the potentials of CH3F and CF4 are indicative of fluorine interacting only with electrophiles, as is found experimentally. The strongly positive potentials at the ends of the chlorines and bromines in CCl4 and CBr4 are consistent with complexes that these form with electron donors, e.g., the π regions of benzene and p-xylene and the lone pairs of pyridine and tetrahydrofuran. © 1992 John Wiley & Sons, Inc.

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