Title: aminium ions
Long Title: IUPAC Gold Book - aminium ions
DOI: 10.1351/goldbook.A00277
Status: current

Definition
Cations $\ce{HR3N^{+}}$ formed by hydronation of an amine $\ce{R3N}$. 'Non-quaternary ammonium ions' is a synonymous term, e.g. prolinium, $\ce{PhN^{+}HMe2}$, $N,N$-dimethylanilinium.

Note
If a class X can be hydronated to Xium ions the class Xium ions commonly includes the derivatives formed by the replacement of the added hydron with a hydrocarbyl group. Aminium ions form an exception, made possible by the availability of the class name ammonium ions.

Related Terms
- hydron: https://goldbook.iupac.org//terms/view/H02904
- onium compounds: https://goldbook.iupac.org//terms/view/O04291

Source
- PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1316 (https://doi.org/10.1351/pac199567081307)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/A00277/html
- json: https://goldbook.iupac.org/terms/view/A00277/json
- xml: https://goldbook.iupac.org/terms/view/A00277/xml

Citation: Citation: 'aminium ions' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.A00277
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Accessed: 2026-06-21T07:59:57+00:00