Benzimidazolium-based simple host for fluorometric sensing of , F−, and AMP under different conditions

Pyrene appended benzimidazolium-based simple cleft 1 has been synthesized. The open cleft of 1 distinguishes H 2 PO 4 - and F− selectively by showing binding induced different emission characteristics in CH3CN. The chemosensor 1 also functions in aqueous CH3CN and shows marked change in emission in the presence of sodium phosphate at pH 6.5 and AMP at pH 7.3. Binding studies have been carried out using fluorescence, UV–vis and 1H NMR spectroscopic techniques.