Synthesis, Structure, and Properties of Complexes Based on 2,4-Bis-(triazol-1-yl)benzoic Acid as a Ligand.

ABSTRACT: Using 2,4-bis-(triazol-1-yl)-benzoic acid as the main ligand and terephthalic acid (TPA) as the auxiliary ligand, combined with Cd(NO₃)₂·4H₂O and Zn(NO₃)₂·6H₂O, self-assembly under solvothermal conditions gave three novel complexes: [Cd_0.5(L)(H₂O)] (1), [Cd(L)(TPA)_0.5(H₂O)]·H₂O (2), and [Zn(L)(TPA)_0.5]·H₂O (3) (TPA = terephthalic acid). The crystal structure test showed that complex 1 belongs to the triclinic crystal system and the P1̅ space group and complexes 2 and 3 belong to the monoclinic crystal system and the P2₁/c space group. Solid-state fluorescence experiments show that complexes 1, 2, and 3 all have excellent optical properties: among them, complexes 1 and 3 can selectively detect MnO₄ ^- with low detection limits (0.96 μM and 0.232 μM, respectively) and complex 2 can detect Cr₂O₇ ^2- [limit of detection (LOD) = 0.035 μM], and the most interesting thing is that all three complexes can be used as sensors for detecting Fe³⁺ (LOD = 0.76 μM, 0.657 μM, and 0.11 μM, respectively). In addition, the detection capabilities of these three complexes for different amino acids and antibiotics were also analyzed, and the results showed that all three complexes can effectively detect tetracycline hydrochloride through the quenching effect and 2 and 3 can selectively detect tryptophan via the fluorescence enhancement effect.

SUBMITTER: Yang Y 

PROVIDER: S-EPMC9178759 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature