Hexaaqua­cadmium(II) bis­{[N-(2-oxidobenzyl­idene)glycyl-l-leucinato]cuprate(II)} dihydrate

The title compound, [Cd(H(2)O)(6)][Cu(C(15)H(17)N(2)O(4))](2)·2H(2)O, has a chiral structure. Copper has a square-planar coordination with two N and two O atoms of the quadridentate chiral Schiff base ligand. The Cd(2+) ion is coordinated by six aqua ligands with a slightly distorted octa­hedral configuration. Ions are linked by O—H⋯O hydrogen bonds, and the [Cd(H(2)O)(6)](2+) cations and [CuL](−) anions (L = Schiff base derived from glycyl-l-leucine and salicylaldehyde) occupy a stacking structure within well separated columns along the a axis. The two crystallographically independent copper–Schiff base anions each have a chiral carbon centre with an S configuration. They are related by a non-crystallographic twofold rotation axis parallel to the [010] direction.