Abstract
Design of fluorescent chemosensors for convenient detection of organotin species is an important but challenging task. Herein, a highly selective fluorescent sensing system for organotin bromides (OTBs) has been developed based on PbnCl3nn− clusters. This type of clusters can be easily formed by inexpensive off-the-shelf reagents. Addition of OTBs rapidly induces a transformation from PbnCl3nn− to PbnBr3nn− clusters via halogen replacement reaction. Both of the chloride and bromide clusters are found to be fluorescent with unusually large Stokes’ shifts and have been characterized by single crystal X-ray diffraction. A remarkable fluorescence change is observed with high selectivity toward OTBs over organotin fluorides, organotin chlorides, ionic bromides, or other covalent organobromines. Taking advantage of the fluorescence response, quantitative detection of OTBs at the micromolar concentration level in aprotic solvents can be established.
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