3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||43.02 g mol−1|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|(what is ?)|
Fulminic acid is a chemical compound, an acid with the formula HCNO, more specifically H–C≡N+–O−. It is an isomer of isocyanic acid H–N=C=O and of its elusive tautomer cyanic acid H–O–C≡N, and also of isofulminic acid H–O–N+≡C−.
Fulminate is the anion [C−≡N+–O−] or any of its salts. For historical reasons, the fulminate functional group is understood to be –O–N+≡C− as in isofulminic acid; whereas the group –C≡N+O− is called nitrile oxide.
Fulminic acid was long believed to have a structure of H–O–N+≡C−. It wasn't until the 1966 isolation and analysis of a pure sample of fulminic acid that this structural idea was conclusively disproven. The chemical that actually has that structure, isofulminic acid (a tautomer of the actual fulminic acid structure) was eventually detected in 1988.