A Water‐Stable Luminescent ZnII Metal‐Organic Framework as Chemosensor for High‐Efficiency Detection of CrVI‐Anions (Cr2O72− and CrO42−) in Aqueous Solution

Abstract: A new luminescent ZnII‐MOF with 1D triangular channels along the <italic>b</italic> axis, namely <bold>NUM‐5</bold>, has been successfully assembled and well characterized, which features good stability, especially in aqueous solution. Interestingly, this compound exhibits a fast, sensitive and selective luminescence quenching response towards CrVI (Cr2O72−/CrO42−) in aqueous solution. The detection limits towards Cr2O72− and CrO42− ions are estimated to be 0.7 and 0.3 ppm, respectively, which are among the lowest detection limits reported for the MOF‐based fluorescent probes that can simultaneously detect Cr2O72− and CrO42− in aqueous environment. The possible detection mechanism has been discussed in detail. Moreover, it can be easily regenerated after detection experiments, indicative of excellent recyclability. All these results suggest <bold>NUM‐5</bold> to be a highly selective and recyclable luminescent sensing material for the quantitative detection of CrVI anions in aqueous solution. [ABSTRACT FROM AUTHOR]