Dimethyl­ammonium perchlorate 18-crown-6 monohydrate clathrate

The reaction of dimethyl­amine, 18-crown-6, and perchloric acid in methanol yields the title compound, C(2)H(8)N(+)·ClO(4) (−)·C(12)H(24)O(6)·H(2)O. The dimethyl­ammonium cation and the water mol­ecule inter­act with the 18-crown-6 unit: N—H⋯O hydrogen bonds are formed between the ammonium NH(2) (+) group and four O atoms of the crown ether, while the water mol­ecule on the other side of 18-crown-6 ring forms O—H⋯O hydrogen bonds with two other O atoms of the crown ether. All conventional donors and acceptors in the cations are thus engaged in hydrogen bonding. The ClO(4) (−) anion is disordered over two sites, and occupancies for the disordered O atoms were fixed at 0.5. In the crystal, the cations and anions are arranged in alternating layers.