A diboryne in chemistry is a chemical compound containing a boron-to-boron triple bond. Such compounds are of fundamental importance in the study of chemical bonding, though only few have been reported. A diboryne stabilized by two carbon monoxide groups (OCBBCO) was reported isolated in matrix isolation in 2002. A diboryne stable at room temperature with two N-heterocyclic carbene (NHC) units was reported in 2012. In terms of qualitative MO theory the B2 molecule is expected to have a single bond but with NHC ligands the third excited state yields a triple bond.
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- Braunschweig, H.; Dewhurst, R. D.; Hammond, K.; Mies, J.; Radacki, K.; Vargas, A. (2012). "Ambient-Temperature Isolation of a Compound with a Boron-Boron Triple Bond". Science 336 (6087): 1420–2. doi:10.1126/science.1221138. PMID 22700924.
- Frenking, G.; Holzmann, N. (2012). "A Boron-Boron Triple Bond". Science 336 (6087): 1394–5. doi:10.1126/science.1224003. PMID 22700911.