Hydroxide

Aluminium hydrolysis as a function of pH. Water molecules attached to Al are omitted

Numerous mixed ligand complexes of these metals with the hydroxide ion exist. In fact these are in general better defined than the simpler derivatives. Many can be made by deprotonation of the corresponding metal aquo complex.

The hydroxide ion by itself is not a strong enough base, but it can be converted in one by adding sodium hydroxide to ethanol