Polymeric aqua‐1κO‐bis[μ‐(R,R)‐tartrato‐1κ2O1,O2:2κ2O3,O4]dicadmium(II) trihydrate

The structure of the title compound, {[Cd-2(C4H4O6)(2)(H2O)] . 3H(2)O}(n), consists of corrugated polymeric sheets of dimeric [Cd-2(C4H4O6)(2)(H2O)] units and three water molecules of crystallization. Both cadmium ions are coordinated by two (R,R)-tartrate ligands in a cis arrangement, and the octahedral geometry for each cation is completed by two carboxyl O atoms of different neighbouring dimers or by one carboxyl O atom and a water molecule. Additional water molecules are held in the crystal lattice, forming a hydrogen-bonding network to keep the dimers together in the nonplanar sheets.