Diborane(2)

Diborane(2)
Names
	Other names Diborene
Identifiers
3D model (JSmol)	Interactive image;
ChemSpider	24807783;
PubChem CID	15334965;
	InChI InChI=1S/B2H2/c1-2/h1-2H Key: HWGHUECIBSMKRW-UHFFFAOYSA-N;
	SMILES B=B;
Properties
Chemical formula	B2H2
Molar mass	23.64 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Diborane(2) or diborene is a theoretical/hypothetical inorganic compound with the formula B₂H₂. It is predicted to have a symmetric covalently bonded structure of H–B=B–H with linear geometry.[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.
Yuzhong Wang, Brandon Quillian, Pingrong Wei, Chaitanya S. Wannere, Yaoming Xie, R. Bruce King, Henry F. Schaefer, III, Paul v. R. Schleyer, and Gregory H. Robinson (2007). "A Stable Neutral Diborene Containing a B=B Double Bond". J. Am. Chem. Soc. 129 (41): 12412–12413. doi:10.1021/ja075932i. PMID 17887683.CS1 maint: uses authors parameter (link)

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[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.

[3] Yuzhong Wang, Brandon Quillian, Pingrong Wei, Chaitanya S. Wannere, Yaoming Xie, R. Bruce King, Henry F. Schaefer, III, Paul v. R. Schleyer, and Gregory H. Robinson (2007). "A Stable Neutral Diborene Containing a B=B Double Bond". J. Am. Chem. Soc. 129 (41): 12412–12413. doi:10.1021/ja075932i. PMID 17887683.CS1 maint: uses authors parameter (link)