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 6.23μM and 2.13μM/2.87μM. 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.
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