Dimethylammonium perchlorate 18-crown-6 monohydrate clathrate

Abstract

The reaction of dimethyl­amine, 18-crown-6, and perchloric acid in methanol yields the title compound, C2H8N+·ClO4 −·C12H24O6·H2O. The dimethyl­ammonium cation and the water mol­ecule inter­act with the 18-crown-6 unit: N—H⋯O hydrogen bonds are formed between the ammonium NH2 + 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 ClO4 − 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.