Onium Cations With Monovalent Substitutions
- primary ammonium cations, RH3N+ or RNH+
3 (protonated primary amines)- hydroxylammonium, NH3OH+ (protonated hydroxylamine)
- methylammonium, CH3NH+
3 (protonated methylamine) - ethylammonium, C2H5NH+
3 (protonated ethylamine) - hydrazinium, or diazanium, NH2NH+
3 (protonated hydrazine, a.k.a. diazane)
- secondary ammonium cations, R2NH+
2 (protonated secondary amines)- dimethylammonium (sometimes dimethylaminium), (CH3)2NH+
2 (protonated dimethylamine) - diethylammonium (sometimes diethylaminium), (C2H5)2NH+
2 (protonated diethylamine) - ethylmethylammonium, C2H5CH3NH+
2 (protonated ethylmethylamine) - diethanolammonium (sometimes diethanolaminium), (C2H4OH)2NH+
2 (protonated diethanolamine)
- dimethylammonium (sometimes dimethylaminium), (CH3)2NH+
- tertiary ammonium cations, R3NH+ (protonated tertiary amines)
- trimethylammonium (CH3)3NH+ (protonated trimethylamine)
- triethylammonium (C2H5)3NH+ (protonated triethylamine)
- quaternary ammonium cations, R4N+ or NR+
4- tetramethylammonium, (CH3)4N+
- tetraethylammonium, (C2H5)4N+
- tetrapropylammonium, (C3H7)4N+
- tetrabutylammonium, (C4H9)4N+ or abbreviated Bu4N+
- trimethyl ammonium compounds, (CH3)3RN+
- didecyldimethylammonium, (C10H21)2(CH3)2N+
- pentamethylhydrazinium, N(CH3)2N(CH3)+
3
- quaternary phosphonium cations, R4P+ or PR+
4- tetraphenylphosphonium, (C6H5)4P+
- secondary sulfonium cations, R2SH+ (protonated sulfides)
- dimethylsulfonium, (CH3)2SH+ (protonated dimethyl sulfide)
- tertiary sulfonium cations, R3S+
- trimethylsulfonium, (CH3)3S+
- secondary fluoronium cations, R2F+
- dichlorofluoronium, Cl2F+
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