Lyonium ion

Summary

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 CH
3
OH+
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 Lyonium ion
name formula name formula name formula
Fluoride F
Hydrogen fluoride HF Fluoronium H
2
F+
Hydroxide HO
Water H
2
O
Hydronium H
3
O+
Azanide NH
2
Ammonia NH
3
Ammonium NH+
4
CH
3
Methane CH
4
Methanium CH+
5
Methoxide CH
3
O
Methanol CH
4
O
CH
5
O+

See also

References

  1. ^ IUPAC Gold Book - lyonium ion