Poly[[μ(4)-tartrato-cadmium(II)] 0.167-hydrate].

The title compound, {[Cd(C(4)H(4)O(6))]·0.167H(2)O}(n), adopts a three-dimensional network structure in which each Cd(II) ion is chelated by two pairs of carboxyl-ate and hydroxyl O atoms from two tartrate anions, and is additionally linked to two O atoms of two carboxyl-ate groups that are not involved in chelation. The asymmetric unit has four independent cadmium atoms, two of which lie on special positions of 2 site symmetry. The tartrate anions all lie on general positions. All hydroxyl groups are engaged in O-H⋯O hydrogen-bonds, one of which is also bifurcated. The non-coordinating water molecule is situated on a site with half-occupation.