Nitryl is the nitrogen dioxide (NO<sub>2</sub>) moiety when it occurs in a larger compound as a univalent fragment. Examples include nitryl fluoride (NO<sub>2</sub>F) and nitryl chloride (NO<sub>2</sub>Cl).
Like nitrogen dioxide, the nitryl moiety contains a nitrogen atom with two bonds to the two oxygen atoms, and a third bond shared equally between the nitrogen and the two oxygen atoms. The nitrogen-centred radical is then free to form a bond with another univalent fragment (X) to produce an NâÂÂX bond, where X can be F, Cl, OH, etc.
In organic nomenclature, the nitryl moiety is known as the nitro group. For instance, nitryl benzene is normally called nitrobenzene (PhNO<sub>2</sub>).