One-dimensional cadmium(II) coordination polymers:: Syntheses and crystal structures of [Cd(H2O)3(C5H6O4)]•2H2O, Cd(H2O)2(C6H8O4), and Cd(H2O)2(C8H12O4)

[Cd(H2O)(3)(C5H6O4)].2H(2)O (1) and Cd(H2O)(2)(C6H8O4) (2) were prepared from reactions of fresh CdCO3 precipitate with aqueous solutions of glutaric acid and adipic acid, respectively, while Cd(H2O)(2)(C8H12O4) (3) crystallized in a filtrate obtained from the hydrothermal reaction of CdCl2.2.5H(2)O, suberic acid and H2O. Compound 1 consists of hydrogen bonded water molecules and linear (1)(infinity){[Cd(H2O)(3)](C5H6O4)(2/2)} chains, which result from the pentagonal bipyramidally coordinated Cd atoms bridged by bischelating glutarato ligands. In 2 and 3, the six-coordinate Cd atoms are bridged by bis-chelating adipato and suberato ligands into zigzag chains according to (1)(infinity)[Cd(H2O)(3)](C5H6O4)(2/2)} and (1)(infinity)[Cd(H2O)(2)](C8H12O4)(2/2)}, respectively. The hydrogen bonds be- tween water and the carboxylate oxygen atoms are responsible for the supramolecular assemblies of the zigzag chains into 3D networks. Crystallographic data: (1) P (1) over bar (no. 2), a = 8.012(1), b = 8.160(1), c = 8.939(1) Angstrom, a = 82.29(1)degrees, beta = 76.69(1)degrees, gamma = 81.68(1)degrees, U = 559.6(1) Angstrom(3), Z = 2; (2) C2/c (no. 15), a = 16.495(1), b = 5.578(1), e = 11.073(1) Angstrom, beta = 95.48(1)degrees, U = 1014.2(1) Angstrom(3), Z = 4; (3) P2/c (no. 13), a = 9.407(2), b = 5.491(1), c = 11.317(2) Angstrom, beta = 95.93(3)degrees, U = 581.4(2) Angstrom(3), Z = 2.