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.
Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 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.
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 251, 1 January 2013, Pages 128–133