Nitrosonium ion
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Systematic IUPAC name
Oxidonitrogen(1+)
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| Other names
Nitrosonium
Iminooxidanium |
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3D model (JSmol)
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| Abbreviations | NO(+) |
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| 456 | |
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PubChem CID
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The nitrosonium ion is NO+, in which the nitrogen atom is bonded to an oxygen atom with a bond order of 3, and the overall diatomic species bears a positive charge. This ion is usually obtained as the following salts: NOClO4, NOSO4H (nitrosylsulfuric acid, more descriptively written ONSO3OH), and NOBF4. The ClO−
4 and BF−
4 salts are slightly soluble in CH3CN. NOBF4 can be purified by sublimation at 200–250 °C and 0.01 mmHg (1.3 Pa).
NO+ is isoelectronic with CO, CN− and N2. It arises via protonation of nitrous acid:
NO+ reacts readily with water to form nitrous acid:
For this reason, nitrosonium compounds must be protected from water or even moist air. With base, the reaction generates nitrite:
NO+ reacts with aryl amines, ArNH2, to give diazonium salts, ArN+
2. The resulting diazonium group is easily displaced (unlike the amino group) by a variety of nucleophiles.
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