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Single sensor for multiple analytes: fluorogenic detection of Al3+ in aqueous media and AcO− in organic media

A simple novel receptor, designed to have a combination of both oxygen and nitrogen-binding sites for metal ion and hydrogen bond donor sites for anion, was synthesised. The receptor has been explored for the selective detection of cation Al3+ over the other interfering metal ions and anion AcO− against a range of physiologically relevant anions in the fluorescence spectroscopy. The receptor shows a different response to aluminium and acetate in the emission spectra. The binding isotherm and detection limit demonstrate that the receptor is an excellent fluorometric probe for Al3+ and AcO− . Our receptor HNQ represents a ‘Single sensor for multiple analytes’. A new array for the ‘naked-eye’ detection of cation (Al3+, blue colour) and anion (AcO− , green colour) in the emission spectra. The dual sensing to Al3+ and AcO− is rare.