Frontispiece: Anionic CH⋅⋅⋅X− Hydrogen Bonds: Origin of Their Strength, Geometry, and Other Properties [feedly]

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Frontispiece: Anionic CH⋅⋅⋅X− Hydrogen Bonds: Origin of Their Strength, Geometry, and Other Properties
// ChemEurJ

The Power of the H-Bond Because of its importance and widespread occurrence, the phenomenon of H-bonding has motivated an enormous amount of investigative effort over the years. In their Full Paper on page 1474 ff., B. Nepal and S. Scheiner describe the various sources of binding in the CH⋅⋅⋅X⁻ⁿ H-bond between F₃CH and various anions. The top figure in the highlight graphic shows the charge transfer from a F lone pair into the σ*(CH) antibonding orbital. The Coulombic attraction between the F⁻ anion and the most positive region of F₃CH is displayed in the middle section. The lower segment illustrates the redistribution of electron density that occurs when the two subunits interact, increases in purple and losses in blue.

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B.Osmialowski