Compounds having the nitro group, –NO2 (free @V06588@ on nitrogen), which may be attached to carbon, nitrogen (as in @N04144@), or oxygen (as in nitrates), among other elements (in the absence of specification, C-nitro compounds are usually implied).
See also:
dipolar compounds
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1351 [Terms] [Paper]