Dihydrogen bond: Difference between revisions

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| accessdate = 2009-04-29
| date = 1968
| urldoi = http://dx.doi.org/10.1039/C19680001551
}}</ref> They observed intense absorptions in the [[IR spectroscopy|IR band]]s at 3300 and 3210&nbsp;cm<sup>-1</sup> for a solution of (CH<sub>3</sub>)<sub>2</sub>NHBH<sub>3</sub>. The higher energy band is assigned to a normal N-H vibration whereas the lower energy band is assigned to the same bond, which is interacting with the B-H. Upon dilution of the solution, the 3300&nbsp;cm<sup>-1</sup> band increased in intensity and the 3210&nbsp;cm<sup>-1</sup> band decreased, indicative of intermolecular association.
| accessdate = 2009-04-29
| date = 1996-01-01
| pmid = 19904922
| url = http://dx.doi.org/10.1021/ar950150s
}}</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 atoms are involved, this is termed a dihydrogen bond.
| accessdate = 2009-04-28
| date = 2001-07-01
| pmid = 11710237
| url = http://dx.doi.org/10.1021/cr000021b