Abstract
AbstractIn this study, a new fluorescent sensor for Cs+ ion was designed and synthesized from the combination of pyridine‐2,6‐dicarboxamide and 4,4‐difluoro‐4‐borata‐3a,4a‐diaza‐s‐indacene (BODIPY) scaffolds. The sensing capability of the target compound against a variety of ions was investigated. The structure of the target compound was proved by matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry, and 1H and 13C NMR spectroscopies. Photophysical properties of the amide‐linked BODIPY compound were studied by utilizing fluorescence spectroscopies in DMSO/water (9:1, v/v) solution. It was found that the final amide‐linked BODIPY compound showed exclusively selective and sensitive turn‐off sensor behavior for Cs+ ion over other metal ions (Li+, Na+, K+, Cs+, Mg2+, Ca2+, Ba2+, Hg2+, Pb2+, Mn2+, Cd2+, Ag+, Ni2+, Cu2+, Zn2+, Co2+, Cr3+ and Fe3+). The addition of Cs+ resulted in quenching of fluorescence intensity and the detection limit was calculated to be 0.273 μM. According to Job's Plot, binding stoichiometry ratio of the target compound with Cs+ was 1:1.
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