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. (C₈H₁₈N₂)[CuCl₃(NO₃)(H₂O)]. 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. [ABSTRACT FROM AUTHOR]