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)^[2] is the chemical compound HNO. It is well known in the gas phase.^[3]^[4] 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.

^ "Nitroxyl". PubChem. Retrieved August 24, 2022.
^ Doctorovich, F.; Bikiel, D.; Pellegrino, J.; Suárez, S. A.; Larsen, A.; Martí, M. A. (2011). "Nitroxyl (azanone) trapping by metalloporphyrins". Coordination Chemistry Reviews. 255 (23–24): 2764–2784. doi:10.1016/j.ccr.2011.04.012. hdl:11336/68714.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ Wiberg, Egon; Holleman, Arnold Frederick (2001). Inorganic Chemistry. Elsevier. ISBN 978-0-12-352651-9.

[1] "Nitroxyl". PubChem. Retrieved August 24, 2022.

[2] Doctorovich, F.; Bikiel, D.; Pellegrino, J.; Suárez, S. A.; Larsen, A.; Martí, M. A. (2011). "Nitroxyl (azanone) trapping by metalloporphyrins". Coordination Chemistry Reviews. 255 (23–24): 2764–2784. doi:10.1016/j.ccr.2011.04.012. hdl:11336/68714.

[3] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[Wiberg&Holleman-4] Wiberg, Egon; Holleman, Arnold Frederick (2001). Inorganic Chemistry. Elsevier. ISBN 978-0-12-352651-9.

[1]

[2]

[3]

[4]

Names

IUPAC name Azanone
Systematic IUPAC name Oxidanimine^[1]
Other names Hydrogen nitroxide Hydrogen oxonitrate(I) Hyponitrous acid monomer Nitronous oxide Nitrosyl hydride
Identifiers
CAS Number	14332-28-6^Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL1200689^Y
ChemSpider	920^Y
MeSH	Nitroxyl
PubChem CID	945
UNII	GFQ4MMS07W^Y
InChI InChI=1S/HNO/c1-2/h1H^Y Key: ODUCDPQEXGNKDN-UHFFFAOYSA-N^Y
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