nitrosoniumn.
/ˌnʌɪtrəʊˈsəʊnɪəm/, U.S. /ˌnaɪtroʊˈsoʊniəm/ Chemistry.
The nitrosyl cation NO+, formed when nitrogen oxides dissolve in very strong acids. Usually attributive.
ΚΠ
1934 Chem. Abstr. 28 4997 Nitrosonium chloride... Pure NO..forms NO.HCl very readily in the presence of higher N oxides.
1962 P. J. Durrant & B. Durrant Introd. Adv. Inorg. Chem. xix. 665 The properties of the nitrosonium ion may be correlated with a resonance structure consisting of the four canonical forms... The N—O distance in nitrosonium compounds is only slightly less than the distance in nitric oxide.
1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) x. 322 The electron in the π* orbital is relatively easily lost..to give the nitrosonium ion (NO+), which has an extensive and important chemistry.
1996 Biochem. Pharmacol. 51 1597/1 When sGC was treated with nitrosonium salts in aqueous solution, slight and inconsistent activation of the enzyme was observed.
This is a new entry (OED Third Edition, December 2003; most recently modified version published online March 2022).
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n.1934