https://doi.org/10.1351/goldbook.Q05003
Derivatives of @[email protected], (NH4+)Y, in which all four of the hydrogens bonded to nitrogen have been replaced with @[email protected] groups. Compounds having a carbon-nitrogen double bond (i.e. R2C=N+R2Y) are more accurately called @[email protected] e.g. [(CH3)4N]+OH, tetramethylammonium hydroxide.
See:
onium compounds
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1361 [Terms] [Paper]