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Dihydrogen bond: Difference between revisions
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}}</ref> In other words, the amine is a protic acid and the borane end is hydridic. The resulting B−H<sup>...</sup>H−N attractions stabilize the molecule as a solid. In contrast, the related substance [[ethane]], H<sub>3</sub>CCH<sub>3</sub>, is a gas with a boiling point 285 °C lower. Because two hydrogen centers are involved, the interaction is termed a dihydrogen bond.
Formation of a dihydrogen bond is assumed to precede formation of H<sub>2</sub> from the reaction of a hydride and a protic acid. A very short dihydrogen bond is observed in NaBH<sub>4</sub>·2H<sub>2</sub>O with H−H contacts of 1.79, 1.86, and 1.94 Å.<ref name=ChemRev>{{Cite journal
[[Category:Chemical bonding]]
[[Category:Hydrogen physics]]
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