Lyonium ion

In chemistry, a lyonium ion is the cation derived by the protonation of a solvent molecule.[1] For example, a hydronium ion is formed by the protonation of water, and CH3OH+2 is the cation formed by the protonation of methanol.

Its counterpart is a lyate ion, the anion formed by the deprotonation of a solvent molecule.

Lyonium and lyate ions, resulting from molecular autoionization, contribute to the molar conductivity of protolytic solvents.

Examples

Lyate ion Original solvent
name formula name formula name formula
Fluoride F− Hydrogen fluoride HF Fluoronium H2F+
Hydroxide OH− Water H2O Hydronium H3O+
Azanide NH−2 Ammonia NH3 Ammonium NH+4
Methanide CH−3 Methane CH4 Methanium CH+5
Methoxide CH3O− Methanol CH3OH Methyloxonium CH3OH+2

See also

References

  1. ^ IUPAC Gold Book - lyonium ion


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