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(+)center dot ClO(4)center dot C(12)H(24)O(6)center dot H(2)O. The dimethylammonium cation and the water molecule interact with the 18-crown-6 unit: N-H center dot center dot center dot 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 center dot center dot center dot 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.