catena-Poly[[triaquacopper(II)]-mu-5-carboxybenzene-1,3-dicarboxylato-kappa O-2(1):O-3]

In the title complex, [Cu(C9H4O6)(H2O)(3)] n, the Cu II cation exhibits a distorted square-pyramidal coordination geometry involving five O atoms from two monodentate 5-carboxybenzene-1,3-dicarboxylate anions and three water molecules. The 5-carboxybenzene-1,3-dicarboxylate anions bridge Cu-II cations into zigzag polymeric chains running along the b-axis direction. These chains are further linked by O-H center dot center dot center dot O hydrogen bonds between coordinating water molecules or carboxyl groups and carboxylate groups into a three-dimensional supramolecular architecture. In the crystal, pi-pi stacking is observed between parallel benzene rings of adjacent chains, the centroid-centroid distances being 3.584 (3) and 3.684 (3) angstrom.