Protonated hydrogen cyanide

Protonated hydrogen cyanide
Names
	IUPAC names Methylidyneammonium, Methylidyneazanium
	Systematic IUPAC name Methylidyneammonium
	Other names Methanimine, iminomethylcation;; 1-azoniaethyne;; iminomethylium
Identifiers
CAS Number	38263-97-7 ;
3D model (JSmol)	linear form (HC≡N+H): Interactive image; HC+=NH: Interactive image; CNH+; 2: Interactive image; H2CN+: Interactive image; cis-HCNH+: Interactive image; trans-HCNH+: Interactive image;
ChemSpider	10446358 linear form (HC≡N+H); 18948137 HC+=NH;
PubChem CID	22952220 linear form (HC≡N+H); 274441977;
	InChI 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;
	SMILES 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
Chemical formula	CH2N+1
Molar mass	28.033 g·mol−1
Conjugate base	Hydroisocyanic acid
Structure
Point group	C∞v (linear form (HC≡N+H))
Molecular shape	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
Related isoelectronic	ethyne
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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.