A regenerable zinc(II) coordination polymer as a dual-luminescent sensor for detection of Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> and 2,4,6-trinitrophenol in aqueous phase

<p>Developing a fast and sensitive method for the detection of 2,4,6-trinitrophenol (TNP) or Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> in aqueous solution has received great attention. In this work, a regenerable fluorescent coordination polymer [Zn(L)(H<sub>2</sub>L)]<sub>n</sub> (<b>1</b>) has been successfully constructed using a novel Schiff base ligand <i>N</i>'-[(E)-(3,5-dibromo-2-hydroxyphenyl)methylene]isonicotinohydrazide(H<sub>2</sub>L) and exploited as a dual detection probe for the selective sensing of Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> and TNP in water media. Competitive fluorometric experiments involving mixtures of anions or nitro compounds demonstrated <b>1</b> as an efficient and selective sensor for both Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> and TNP. The limits of detection for Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> and 2,4,6-trinitrophenol in aqueous solutions were found to be 11.4 and 1.19 μM, respectively. Moreover, <b>1</b> can detect TNP and Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> in real water samples. All these features clearly demonstrate its great potential of practical TNP and Cr<sub>2</sub>O<sub>7</sub><sup>2–</sup> detection in water media for public safety and security.</p>