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Preferred Label : onium compounds;

IUPAC definition : derivatives formed by substitution of the above parent ions by groups having two or three free valencies on the same atom. such derivatives are, where possible, designated by a specific class name. e.g. r c 3 o1 hydrocarbylidyne oxonium ions, r2 c 2 n1 h2 x-1 iminium compounds, r c 3 n h1 nitrilium ions.; derivatives formed by substitution of the above parent ions by univalent groups. the number of substituted hydrogen atoms is, especially in the case of hydrocarbyl substituents, indicated by the adjectives primary, secondary, tertiary or quaternary. e.g. cl 2 f 1 dichlorofluoronium, c h3 2 s1 h dimethylsulfonium (a secondary sulfonium ion), cl c h3 3 p1 chlorotrimethylphosphonium, c h3 c h2 4 n1 tetraethylammonium (a quaternary ammonium ion). arsonium compounds halonium ions oxonium ions phosphonium compounds quaternary ammonium compounds stibonium compounds sulfonium compounds; cations (with their counter-ions) derived by addition of a hydron to a mononuclear parent hydride of the nitrogen, chalcogen and halogen families. h 4 n 1 ammonium h 3 o 1 oxonium h 2 f 1 fluoronium h 4 p 1 phosphonium h 3 s 1 sulfonium h 2 cl 1 chloronium h 4 as 1 arsonium h 3 se 1 selenonium h 2 br 1 bromonium h 4 sb 1 stibonium h 3 te 1 telluronium h 2 i 1 iodonium h 4 bi 1 bismuthonium;

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derivatives formed by substitution of the above parent ions by groups having two or three free valencies on the same atom. such derivatives are, where possible, designated by a specific class name. e.g. r c 3 o1 hydrocarbylidyne oxonium ions, r2 c 2 n1 h2 x-1 iminium compounds, r c 3 n h1 nitrilium ions.
derivatives formed by substitution of the above parent ions by univalent groups. the number of substituted hydrogen atoms is, especially in the case of hydrocarbyl substituents, indicated by the adjectives primary, secondary, tertiary or quaternary. e.g. cl 2 f 1 dichlorofluoronium, c h3 2 s1 h dimethylsulfonium (a secondary sulfonium ion), cl c h3 3 p1 chlorotrimethylphosphonium, c h3 c h2 4 n1 tetraethylammonium (a quaternary ammonium ion). arsonium compounds halonium ions oxonium ions phosphonium compounds quaternary ammonium compounds stibonium compounds sulfonium compounds
cations (with their counter-ions) derived by addition of a hydron to a mononuclear parent hydride of the nitrogen, chalcogen and halogen families. h 4 n 1 ammonium h 3 o 1 oxonium h 2 f 1 fluoronium h 4 p 1 phosphonium h 3 s 1 sulfonium h 2 cl 1 chloronium h 4 as 1 arsonium h 3 se 1 selenonium h 2 br 1 bromonium h 4 sb 1 stibonium h 3 te 1 telluronium h 2 i 1 iodonium h 4 bi 1 bismuthonium

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29/07/2025


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