RESUMO
A luminescent Cd(ii) coordination polymer, namely {[Cd(btic)(phen)]·0.5H2O} n (CP-1) (H2btic = 5-(2-benzothiazolyl)isophthalic acid, phen = 1,10-phenanthroline), was constructed through the mixed-ligand method under solvothermal conditions. CP-1 manifests a chain structure decorated with uncoordinated Lewis basic N and S donors. CP-1 exhibits high sensing towards Zn2+, Fe3+ and Cr2O7 2- ions with fluorescence enhancement or quenching. CP-1 exhibited a fluorescence enhancement for Zn2+ ions through weak binding to S and N atoms, and a fluorescence quenching for Fe3+ and Cr2O7 2- ions by an energy transfer process. The binding constants were calculated as 1.812 × 104 mol-1 for Zn2+, 4.959 × 104 mol-1 for Fe3+ and 1.793 × 104 mol-1 for Cr2O7 2-. This study shows CP-1 as a rare multi-responsive sensor material for the efficient detection of Zn2+, Fe3+ and Cr2O7 2- ions.