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

Article abstract of DOI:10.1016/j.jssc.2020.121773

Semi-rigid 6-(carboxymethoxy)-2-naphthoic acid (H₂CNA) was successfully synthesized as a ligand containing O-bridging atom. Six coordination polymers based on H₂CNA ligand and transition metal ions were successfully synthesized under the hydrothermal or solvothermal conditions, which named [Zn(CNA)]_n (1), [Cd(CNA) (H₂O)]_n (2), [Co(HCNA)₂(H₂O)₄] (3), [Ni(HCNA)₂(H₂O)₄] (4), [Cu(CNA) (H₂O)]_n (5), [Ni(CNA) (H₂O)]_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.