Auxiliary ligand directed and temperature controlled assembly of coordination polymers of cadmium (II) sulfate and pyridine-2-yl-1H-imidazole-4,5-dicarboxylic acid systems: Syntheses, crystal structures, photoluminescent properties

Abstract Three interesting metal-organic frameworks, [(Cd 2 (Hpidc)(pdc)] n (1), {[(Cd 2 (Hpidc) 2 (H 2 O)]·H 2 O} n (2), {[(Cd 2 (Hpidc) 2 (H 2 O)]·2H 2 O} n (3) (H 3 pidc = pyridine-2-yl-1H-imidazole-4,5-dicarboxylic acid, H 2 pdc = 2,6-pyridine dicarboxylic acid) have been synthesized under hydrothermal by controlling the temperature and varying with the second organic ligands. Compounds 1 and 2 possess 3D frameworks with a new topological network with 2-nodal (6, 6)-connected net and 2-nodal (5, 6)-connected net respectively. Notably, Compound 3 exhibit a 1-D interesting double Zigzag chain. The thermogravimetric and fluorescence properties of 1–3 were also explored.