Protonated hydrogen cyanide

HCNH+, also known as protonated hydrogen cyanide, is a molecular ion of astrophysical interest. It also exists in the condensed state when formed by superacids.

Protonated hydrogen cyanide
Names
IUPAC names
Methylidyneammonium, Methylidyneazanium
Systematic IUPAC name
Methylidyneammonium
Other names
Methanimine, Iminomethylcation; 1-Azoniaethyne
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/CHN/c1-2/h1H/p+1
    Key: LELOWRISYMNNSU-UHFFFAOYSA-O
  • linear form (HC≡N+H): InChI=1S/CHN/c1-2/h1H/p+1
    Key: LELOWRISYMNNSU-UHFFFAOYSA-O
  • HC+=NH: InChI=1S/CH3N/c1-2/h2H,1H2/q+1
    Key: WFXDWMNZLVWETL-UHFFFAOYSA-N
  • linear form (HC≡N+H): C#[NH+]
  • HC+=NH: [CH+]=N
  • CNH+
    2    : [CH0]=[NH2+]
  • H2CN+: C=[NH0+]
  • cis-HCNH+: [H]/[C]=[N+]\[H]
  • trans-HCNH+: [H]/[C]=[N+]/[H]
Properties
CH2N+1
Molar mass 28.033 g·mol−1
Conjugate base Hydroisocyanic acid
Structure
C∞v (linear form (HC≡N+H))
linear: HC≡N+H
Hazards
Flash point −21.3 to −43.7 °C (−6.3 to −46.7 °F; 251.8 to 229.5 K)
Related compounds
ethyne
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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