Crystal structure of new organically templated copper sulfate with 2-aminopyridinium

The title compound, (C 5 H 7 N 2 ) 2 [Cu(H 2 O) 6 ](SO 4 ) 2 ·4H 2 O [systematic name: bis(2-aminopyridinium) hexaaquacopper(II) bis(sulfate) tetrahydrate], comprises axially elongated hexaaqua-coordinated octahedral Cu II ions located on an inversion centre, non-coordinating sulfate anions, 2-aminopyridinium cations and lattice water molecules. The crystal structure is built of successive inorganic and organic layers extending parallel to (001) that are connected by an extensive three-dimensional hydrogen-bonded network of the type O—H...O and N—H...O, as well as π–π interactions [centroid–centroid distance 3.4140 (14) Å, offset 0.277 Å].