The salt's anion consists of two carbon atoms linked by a triple bond.
This triple bond consists of a sigma bond and two pi bonds.
Each double bond has two additional localized electrons, while each triple bond has four additional electrons (two pairs) between the bonded atoms.
If there are both double bonds and triple bonds, en (double bond) is written before yne (triple bond).
Therefore, the molecule falls into the cyanide group as well due to the presence of the carbon nitrogen triple bond.
This radical can in turn attack the triple bond in acetylene and react efficiently even at low temperatures.
There is one triple bond between carbon atoms 19 and 20.
In these compounds the boron and oxygen form a triple bond prone to cyclotrimerization to boroxines.
