A luminescent cd(II)-metal organic frameworks combined of TPT and H3BTC detecting 2,4,6-trinitrophenol and chromate anions in aqueous

Abstract A new luminescence Cd(II)-MOF (1) ([Cd3(BTC)2(TPT)(H2O)2]·4H2O, TPT = tris(4-pyridyl)triazine, H3BTC = 1,3,5-benzenetricarboxylic acid) was successfully synthesized under solvothermal conditions. 1 contains 3D framework which consist of Cd atoms and btc3− anions with the large channels along c axis. Then, tpt ligands locate in the channels by utilizing three N atoms to bridge two Cd1 atoms and one Cd2 atom. 1 not only possesses remarkable thermal stability, but also can steadily exist in different organic solvents and various acid/ base solutions (pH = 3–12). Moreover, 1 can detect 2,4,6-trinitrophenol (TNP) and chromate (CrO42−/ Cr2O72−) anions with high selectivity and sensitivity in water via the luminescent quenching. The detection limits of 1 for TNP and CrO42−/ Cr2O72− are 6.23 μM and 2.13 μM/ 2.87 μM. The mechanism of TNP luminescence quenching may be attributed to photoinduced electron transfer and resonance energy transfer, and CrO42−/ Cr2O72− quenching involves resonance energy transfer and competitive absorption of light. Additionally, 1 has the great anti-interference ability and repeatability for detecting TNP and CrO42−/ Cr2O72−, which can display the feasibility of this material as a stable luminescent probe in aqueous system.