Construction, structure diversity, luminescent and dye absorption properties of coordination polymers comprising semi-rigid 6-(carboxymethoxy)-2-naphthoic acid.

Semi-rigid 6-(carboxymethoxy)-2-naphthoic acid (H 2 CNA) was successfully synthesized as a ligand containing O-bridging atom. Six coordination polymers based on H 2 CNA ligand and transition metal ions were successfully synthesized under the hydrothermal or solvothermal conditions, which named [Zn(CNA)] n (1), [Cd(CNA) (H 2 O)] n (2), [Co(HCNA) 2 (H 2 O) 4 ] (3), [Ni(HCNA) 2 (H 2 O) 4 ] (4), [Cu(CNA) (H 2 O)] n (5), [Ni(CNA) (H 2 O)] n (6). Single crystal structural analysis revealed that 1 , 2 , 5 and 6 are shown as 2D structures, and 3 – 4 displays 0D structures. All the structures assembled into 3D supramolecular networks by hydrogen bonding interaction. The thermal stability, luminescent properties and UV–vis spectra of these coordination polymers were discussed in detail. In addition, 5 has good adsorption ability for Congo Red with good selectivity. We synthesized and characterized six CPs based on semi-rigid 6-(carboxymethoxy)-2-naphthoic acid. Image 1 • Semi-rigid 6-(carboxymethoxy)-2-naphthoic acid (H 2 CNA) ligand was synthesized. • Six coordination polymers based on H 2 CNA ligand were synthesized. • Compound 5 has good adsorption ability for Congo Red with good selectivity. [ABSTRACT FROM AUTHOR]