A retrievable fluorescence “TURN ON” sensor for sulfide anions

A benzimidazole based tripodal fluorescence derivative (L1) is synthesized and characterized. Combining L1 with Cu2+ shows excellent selectivity toward sulfide anions. The binding stoichiometry of L1 with Cu2+ is established by jobs plot analysis and mass spectral evidence and the binding mode is established by synthesis of a control compound L2. The initial fluorescence of L1 is lost on complexation with Cu2+ and is regained in presence of sulfide. The “OFF-ON” behavior of L1 is studied by Fluorescence, UV/vis and mass spectroscopic methods.

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► The manuscript reports a tripodal flourogenic compound L1 which can selectively sense biologically and environmentally important Sulfide anions.
► The system is completely free from interference of other anions.
► The binding and sensing capability of L1 is studied by detailed emission, absorption and mass spectroscopic techniques.