aminoxides

The anionH2N–O, aminoxide and its N hydrocarbyl derivatives R2N–O; formally derived from hydroxylamines, R2N–OH, by removing a hydron from the hydroxy group, e.g. (CH3)2N–O dimethylaminoxide.
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1317
See also:
PAC, 1993, 65, 1357 (Revised nomenclature for radicals, ions, radical ions and related species (IUPAC Recommendations 1993)) on page 1357