Nitroxyl

Nitroxyl
Names
	IUPAC name Azanone
	Systematic IUPAC name Oxidanimine
	Other names Hydrogen nitroxide; Hydrogen oxonitrate(I); Hyponitrous acid monomer; Nitronous oxide; Nitrosyl hydride
Identifiers
CAS Number	14332-28-6 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL1200689 ;
ChemSpider	920 ;
MeSH	Nitroxyl
PubChem CID	945;
UNII	GFQ4MMS07W ;
	InChI InChI=1S/HNO/c1-2/h1H Key: ODUCDPQEXGNKDN-UHFFFAOYSA-N ;
	SMILES N=O;
Properties
Chemical formula	HNO
Molar mass	31.014 g·mol−1
log P	0.74
Structure
Coordination geometry	Digonal
Molecular shape	Bent
Thermochemistry
Heat capacity (C)	33.88 J K−1 mol−1
Std molar; entropy (S⦵298)	220.91 J K−1 mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Nitroxyl (common name) or azanone (IUPAC name) is the chemical compound HNO. It is well known in the gas phase. Nitroxyl can be formed as a short-lived intermediate in the solution phase. The conjugate base, NO⁻, nitroxide anion, is the reduced form of nitric oxide (NO) and is isoelectronic with dioxygen. The bond dissociation energy of H−NO is 49.5 kcal/mol (207 kJ/mol), which is unusually weak for a bond to the hydrogen atom.

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