One‐dimensional Cadmium(II) Coordination Polymers: Syntheses and Crystal Structures of [Cd(H 2 O) 3 (C 5 H 6 O 4 )]·2H 2 O, Cd(H 2 O) 2 (C 6 H 8 O 4 ), and Cd(H 2 O) 2 (C 8 H 12 O 4 )

[Cd(H 2 O) 3 (C 5 H 6 O 4 )]·2H 2 O ( 1 ) and Cd(H 2 O) 2 (C 6 H 8 O 4 ) ( 2 ) were prepared from reactions of fresh CdCO 3 precipitate with aqueous solutions of glutaric acid and adipic acid, respectively, while Cd(H 2 O) 2 (C 8 H 12 O 4 ) ( 3 ) crystallized in a filtrate obtained from the hydrothermal reaction of CdCl 2 ·2.5H 2 O, suberic acid and H 2 O. Compound 1 consists of hydrogen bonded water molecules and linear   ∞ 1 {[Cd(H 2 O) 3 ](C 5 H 6 O 4 ) 2/2 } chains, which result from the pentagonal bipyramidally coordinated Cd atoms bridged by bis‐chelating 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 {[Cd(H 2 O) 3 ](C 5 H 6 O 4 ) 2/2 } and   ∞ 1 {[Cd(H 2 O) 2 ](C 8 H 12 O 4 ) 2/2 }, respectively. The hydrogen bonds between water and the carboxylate oxygen atoms are responsible for the supramolecular assemblies of the zigzag chains into 3D networks. Crystallographic data: ( 1 ) P 1¯ (no. 2), a = 8.012(1), b = 8.160(1), c = 8.939(1) Å, α = 82.29(1)°, β = 76.69(1)°, γ = 81.68(1)°, U = 559.6(1) Å 3 , Z = 2; ( 2 ) C 2/ c (no. 15), a = 16.495(1), b = 5.578(1), c = 11.073(1) Å, β = 95.48(1)°, U = 1014.2(1) Å 3 , Z = 4; ( 3 ) P 2/ c (no. 13), a = 9.407(2), b = 5.491(1), c = 11.317(2) Å, β = 95.93(3)°, U = 581.4(2) Å 3 , Z = 2.