Crystal structure of (1R,5S)-endo-(8-methyl-8-azoniabi­cyclo­[3.2.1]oct-3-yl)ammonium aqua­tri­chlorido­nitratocopper(II)

The structure of a salt of diprotonated endo-3-amino­tropane crystallized with a copper(II) anionic cluster is reported, viz. (C(8)H(18)N(2))[CuCl(3)(NO(3))(H(2)O)]. Neither ion in the salt has been structurally characterized previously. In the crystal, the ions pack together to form a three-dimensional structure held together by a network of inter­molecular N—H⋯O, O—H⋯Cl and N—H⋯Cl hydrogen-bonding inter­actions. Selective crystallization of the title compound can be considered as a simple method for the separation of the exo and endo isomers of 3-amino­tropane.