A sensitive OFF-ON-OFF fluorescent probe for the cascade sensing of Al 3+ and F - ions in aqueous media and living cells.

A simple Schiff-base ligand 2-hydroxy-1-naphthaldehyde semicarbazone (HNS) was synthesized and characterized. Based on the combined effect of inhibition of CH[double bond, length as m-dash]N isomerization and chelation-enhanced fluorescence (CHEF), HNS functions as a fluorescence "turn on" sensor for Al 3+ in buffered aqueous media. Based on the strong affinity of Al 3+ to F - ions, the in situ generated Al 3+ -HNS complex can also be utilized as an effective chemosensor for F - sensing by metal displacement approach, ensuing quenching of fluorescence by the reversible return of HNS from Al 3+ -HNS complex. Thus a method using a single probe for the detection of both Al 3+ and F - ions is developed. The system exhibits high selectivity and sensitivity for Al 3+ and F - ions and the detection limits were found to be as low as 6.75 × 10 -8 M and 7.89 × 10 -7 M, respectively. Furthermore, the practical applicability of this probe has been examined in living cells.