Diborane(2) is an inorganic compound having the formula B2H2. It has a symmetric covalently bonded structure of HBBH, with a double bond between the two boron atoms and one hydrogen atom bonded to each boron. This compound is unique among the analogous formulas for other elements of the boron group,[1] and also unlike higher boranes such as diborane(6) (B2H6), in that it has a direct boron–boron bond rather than bridging hydrides. The boron–boron bonding in this compound is also a rare example of a pure pi bond, one that does not have any net sigma bonding associated with it.[2]

See also


  1. Treboux, Gabin; Barthelat, Jean Claude (1993). "X-X direct bonds versus bridged structures in group 13 X2H2 potential energy surfaces". J. Am. Chem. Soc. 115 (11): 4870–4878. doi:10.1021/ja00064a056.
  2. Jemmis, Eluvathingal D.; Pathak, Biswarup; King, R. Bruce; Schaefer III, Henry F. (2006). "Bond length and bond multiplicity: σ-bond prevents short π-bonds". Chemical Communications: 2164–2166. doi:10.1039/b602116f.
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