Construction of three novel Co/Zn/Cd(II) coordination polymers based on the same ligands: Different spatial structures, electrocatalysis and photoluminescence properties

Three new metal coordination polymers with different spatial structure, namely {[Co 2 (H 2 O) 6 (4-PDCA) 2 ] 2 ·3H 2 O} n ( SNUT-12 ), {[Cd(H 2 O) 2 (4-PDCA)]·2H 2 O} n ( SNUT-13 ) and [Zn 2 (4-PDCA) 2 ] n ( SNUT-14 ), where H 2 (4-PDCA) = 1-(4-carboxyphenyl)-5-methyl-4-oxo-1,4-dihydropyridazine-3-carboxylic acid, were synthesized by changing the central ion with the same ligand under solvothermal and hydrothermal conditions, which were further characterized by single crystal X-ray diffraction, powder XRD, FT-IR and TGA . Single crystal X-ray analysis revealed that SNUT-12 exhibits a 1D infinite zigzag chains which were constructed by Cobalt(II) ion and 4-PDCA 2− ligand, SNUT-13 features a 2D ladder-like structure. Meanwhile, SNUT-14 displays 2-fold 3D → 3D parallel interpenetrating frameworks. In addition, SNUT-12 exhibited high electrocatalytic oxygen evolution reaction, and SNUT-13, SNUT-14 showed strong fluorescence at room temperature .