A novel one-dimensional coordination polymer with Cd2+ and diethylenetriaminepentaacetic acid

catena-Poly­[[[bis­[di­aqua(4,4′-bi­pyridine)­cadmium(II)]-bis­[μ-(N′′-carboxy­methyl­diethyl­enetri­amine-N,N,N′,N′′-tetra­ace­ta­to)­cadmium(II)]]-μ-4,4′-bi­pyridine] tetradecahydrate], [Cd4­(C14H19N3O10)2(C10H8N2)3(H2O)4]·14H2O or [Cd4(HD­TPA)2(BPY)3(H2O)4]·14H2O, where BPY is 4,4′-bi­pyridine and HDTPA4− is N′′-carboxy­methyl­diethyl­enetri­amine-N,N,N′,N′′-tetra­acetate, consists of a one-dimensional coordination polymer formed from a secondary building unit which comprises four Cd centres. The chain structure of the title compound was obtained by the use of a multidentate organic ligand, N,N,N′,N′′,N′′-diethyl­enetri­amine­penta­acetic acid (H5DTPA), which forms multiple chelate rings with the Cd metal centres. An extended network is formed via hydrogen bonds.