Nitrosyl compounds

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Nitrosyl is a part of the name of chemical compounds that contain NO + or NO - ions, the name is more common for the former. The compounds are derived from nitrogen monoxide NO.

The reduction of nitrogen monoxide results in the hyponitrite - anion NO - which is unstable at temperatures above −95 ° C :

The very easy oxidation of NO produces the nitrosyl or nitrosonium cation NO + :

General structure of nitroso compounds
Linear and angled metal nitrosyl complexes

Examples of nitrosyl compounds are:

Nitrosyl salts react with water to form nitrous acid

Organic compounds of the general form R 1 R 2 R 3 C-N = O, which are formally derived from the NO - ion, are referred to as nitroso compounds . The common feature of these compounds is the NO group, which is known as the nitroso group as a functional group .

If NO (i.e. nitrogen monoxide) occurs neutrally or as an anion or cation as a ligand in complex compounds , these are sometimes referred to as metal-nitrosyl complexes. The nitrosyl ion is isoelectronic to CO, N 2 or CN - , has a degree of bond of 3 and occurs as a nitrosyl radical in mononuclear complexes in a linear or angled arrangement.


  1. Erwin Riedel ; Modern Inorganic Chemistry, 3rd Edition, pp. 663ff