1, 5-Bis (2-hydroxyacetophenone)thiocarbohydrazone: A novel colorimetric and fluorescent dual-mode chemosensor for the recognition of fluoride

► Bisthiocarbohydrazone synthesized have high optical selectivity towards fluoride. ► The sensitivity does not change even in competing solvent DMSO. ► The compound shows “turn on” fluorescence towards fluoride anion.