[Cd{C2(COO)2}(H2O)3]•H2O, the first cadmium salt of acetylenedicarboxylic acid

In catena-poly[[[triaquacadmium(II)]-mu-acetylenedicarboxylato-kappa(4) O,O':O",O'''] hydrate], {[Cd(C4O4)(H2O)(3)].H2O}(n), the Cd-II atom is coordinated by two bidentate carboxylate groups and three water molecules, thus forming a sevenfold coordination polyhedron with all atoms located on general sites. These polyhedra are connected by the bifunctional acetylenedicarboxylate ligands, forming zigzag chains running parallel to [120]. Hydrogen bonds, which involve the non-coordinated water molecule, connect these chains to form a three-dimensional framework.