Two novel metal-organic coordination polymers based on diphosphonate and oxalate: Synthesis, structures and properties

Two 2-(1-imidazole)-1-hydroxyl-1,1'-ethylidenediphosphonato and oxalic acid bridged coordination polymers (H(2)en)[Co-3(H(2)zdn)2(ox)(H2O)(2)] (1) and Cd-2(H(2)zdn)(ox)(0.5)(H2O) (2) (2-(1-imidazole)-1-hydroxy1-1,1-ethylidenediphosphonic acid =H(5)zdn; oxalic acid =H(2)ox) were synthesized under hydrothermal conditions and characterized by the infrared (IR), thermogravimetric analyses (TGA), elemental analyses (EA) and X-ray diffraction (XRD). Compound 1 is bridged by phosphonate anions to 1D chain, and further linked by oxalate anions to 2D layer. Compound 2 is bridged by O-P-O units of H5zdn to the layer, and then pillared by oxalate anions to generate 3D frameworks. Compound 1 shows anti-ferromagnetic behaviors analyzed with the temperature-dependent zero-field ac magnetic susceptibilities, while compound 2 exhibits an influence on the luminescent property. (C) 2015 Elsevier Inc. All rights reserved.