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The synthesis, characterization, and application of mesoporous materials containing boron–dipyrromethene (BODIPY) moieties that allow the sensitive and selective detection of Hg II  in aqueous environments by fluorescence enhancement is reported. For this purpose, BODIPY dye  I  containing a thia‐aza crown ether receptor as the fluorescent probe for the detection of Hg II  in aqueous environments is encapsulated into mesoporous materials to avoid self‐quenching or aggregation in water. Determination of Hg II  is accomplished within a few seconds with high selectivity and sensitivity, reaching a limit of detection of 12 ppt. The determination of trace amounts of Hg II  in natural waters and in fish extracts is demonstrated by using our sensing material. The incorporation of the material into several μ‐PAD strips yields a portable, cheap, quick, and easy‐to‐handle tool for trace Hg II  analysis in water.

chemistryopen

Mix‐&amp;‐Read Determination of Mercury(II) at Trace Levels with Hybrid Mesoporous Silica Materials Incorporating Fluorescent Probes by a Simple Mix‐&amp;‐Load Technique