Acta Cryst. (2008). E64, m94-m95  [ doi:10.1107/S1600536807063635 ]

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

G. Zhang, L. Ye, Y. Zhang and W. Liu

Abstract: The title compound, [Cd(H₂O)₆][Cu(C₁₅H₁₇N₂O₄)]₂·2H₂O, 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 Cd²⁺ ion is coordinated by six aqua ligands with a slightly distorted octahedral configuration. Ions are linked by O-HO hydrogen bonds, and the [Cd(H₂O)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.

Online 6 December 2007

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