Memantinium chloride 0.1-hydrate

The crystal structure of the title compound, C12H22N+·Cl ·0.1H2O, consists of (3,5-dimethyl-1-adamantyl)ammonium chloride (memantinium chloride) and uncoordinated water molecules. The four six-membered rings of the memantinium cation assume typical chair conformations. The Cl counter-anion links with the memantinium cation via N—H...Cl hydrogen bonding, forming channels where the disordered crystal water molecules are located. The O atom of the water molecule is located on a threefold rotation axis, its two H atoms symmetrically distributed over six sites; the water molecule links with the Cl anions via O—H...Cl hydrogen bonding.