Poly[triaqua(μ-butane-1,2,3,4-tetracarboxylato)dicadmium(II)]

Abstract

The asymmetric unit of the title CdII coordination polymer, [Cd2(C8H6O8)(H2O)3]n, contains two crystallographically independent CdII cations, one-half each of two independent anionic butane-1,2,3,4-tetracarboxylate units (L) and three water molecules. Both anionic units lie on inversion centers. One of the CdII ions is six-coordinated by four carboxylate O atoms from four L anions and two water O atoms in a distorted octahedral coordination environment. The other CdII ion is eight-coordinated by seven carboxylate O atoms from four L anions and one water O atom. The anionic units bridge neighboring CdII centers, forming a three-dimensional framework. O—H...O hydrogen-bonding interactions between the water molecules and carboxylate O atoms further stabilize the structure.