Abstract
Two kinds of new complexes based on 3, 5-bis (triazol-1-yl) benzoic acid (HL) and 1, 3, 5-benzenetricarboxylic acid (H3bta), {[Zn2(μ4-L)(μ3-bta(3H2O)]∙H2O}n(1) and {[Cd2(μ4-L)(μ3-bta(3H2O)]∙4H2O}n(2), were prepared by solvothermal reactions and the structures were characterized by single-crystal X-ray diffraction. The experimental results showed that complexes 1 and 2 were isomorphic, in which metal ions were separately chelated with the ligands to form one mononuclear Cd1 and another binuclear Cd2O4 structure. Each metal center (M) can be considered as a three-connection, each M2O4 as a six-connection, and the ligands of HL and H3bta can be used as three-junctions. Finally, complex 1 and 2 showed a (3, 6)-connection of {63}6{66;86;102;12} topology. Solid-state fluorescence experiments showed that only complex 1 could selectively identify Fe3+ (detection limit: 0.11 mM) and Cr6+ (detection limit: 0.1 mM) in aqueous solution by a fluorescence quenching mechanism and the fluorescence quenching constant of Fe3+ reached 104. Dye adsorption experiments showed that the complexes could absorb different organic dyes and the adsorption capacity was 1 > 2. Furthermore, the adsorption efficiency of 1 for methylene blue was as high as 97.64%.
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