Diborane(2)
Diborane(2) is a theoretical inorganic compound with the formula B2H2. It is predicted to have a symmetric covalently bonded structure of HB=BH.[1] It has been suggested that the boron–boron bonding in this compound may be a pure pi bond, one that does not have any net sigma bonding associated with it.[2] The compound will be a very strong Lewis acid as each boron has a share in only 6 valence electrons.
Related compounds, with the general formula R:(BH)=(BH):R, known as diborenes, are stable. The two substituents, R:, supply the two additional electron pairs needed for there to be a conventional double bond between the boron atoms in these compounds.[3]
References
- ^ 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.
- ^ 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.
- ^ "A Stable Neutral Diborene Containing a B=B Double Bond". J. Am. Chem. Soc. 129 (41): 12412–12413. 2007. doi:10.1021/ja075932i. PMID 17887683.
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