Dicyanoacetylene

Dicyanoacetylene

Names
Preferred IUPAC name But-2-ynedinitrile
Identifiers
CAS Number	1071-98-3 N
3D model (JSmol)	Interactive image
ChemSpider	13449 N
PubChem CID	14068
CompTox Dashboard (EPA)	DTXSID50147919
InChI InChI=1S/C4N2/c5-3-1-2-4-6 N Key: ZEHZNAXXOOYTJM-UHFFFAOYSA-N N InChI=1/C4N2/c5-3-1-2-4-6 Key: ZEHZNAXXOOYTJM-UHFFFAOYAR
SMILES N#CC#CC#N
Properties
Chemical formula	C4N2
Molar mass	76.058 g·mol−1
Density	0.907 g/cm3
Melting point	20.5 °C (68.9 °F; 293.6 K)
Boiling point	76.5 °C (169.7 °F; 349.6 K)
Thermochemistry
Std enthalpy of formation (ΔfH⦵298)	+500.4 kJ/mol
Related compounds
Related compounds	Carbon suboxide Cyanogen
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Dicyanoacetylene, also called carbon subnitride or but-2-ynedinitrile (IUPAC), is a compound of carbon and nitrogen with chemical formula C₄N₂. It has a linear molecular structure, N≡C−C≡C−C≡N (often abbreviated as NC₄N), with alternating triple and single covalent bonds. It can be viewed as acetylene with the two hydrogen atoms replaced by cyanide groups.

At room temperature, dicyanoacetylene is a clear liquid. Because of its high endothermic heat of formation, it can explode to carbon powder and nitrogen gas, and it burns in oxygen with a bright blue-white flame at a temperature of 5,260 K (4,990 °C; 9,010 °F), the hottest flame in oxygen; burned in ozone at high pressure the flame temperature exceeds 6,000 K (5,730 °C; 10,340 °F).^[1]