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&minus;H<sup>...</sup>H&minus;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 atoms are involved, this 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><sup>'''.'''</sup>·2H<sub>2</sub>O with H&minus;H contacts of 1.79, 1.86, and 1.94 Å.<ref>{{Cite journal
| doi = 10.1021/cr000021b
| volume = 101