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Reference.org
Nitroxyl
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<p>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 solution. Its conjugate base, NO−, the nitroxide anion, is the <a href="/facts/Redox_reaction/Pyd5RVcj">reduced form</a> of <a href="/facts/Nitric_oxide/UvhdvDzp">nitric oxide</a> (NO) and is <a href="/facts/Isoelectronic/SbzuaI05">isoelectronic</a> with <a href="/facts/Dioxygen/UVNYnKUQ">dioxygen</a>. 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. </p>