A stable Cu-MOF as a dual function sensor with high selectivity and sensitivity detection of picric acid and CrO42-in aqueous solution

Abstract A novel three-dimension (3D) Cu (II)-based metal-organic framework [Cu2(tpt)2(tda)2]⋅H2O (1) (tpt = 2,4,6-Tri(pyridin-4-yl)-1,3,5-triazine, H2tda = 2,5-thiophene dicarboxylic acid) with a four-connected uninodal net has been successfully synthesized under solvothermal conditions. Compound 1, as a dual function sensor for selective and sensitive detection of picric acid (PA) and chromate ions (CrO42−) in solution, not only has high quenching constant and low limit of detection, but also can resist interference of analogues. Furthermore, 1 behaves excellent stability which can steadily exist in different organic solution and acid-based solution. In addition, the cycling experiments of PA-1 and CrO42-1 indicate that 1 has satisfying reusability and promising application in the field of analytical chemistry detection. Meanwhile, the fluorescence quenching mechanism of 1 also be further discussed. Noticeably, the C-V experiment was introduced to further prove fluorescence quenching mechanism, to the best of our knowledge which is the first reported.