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Abstract: A Schiff base-type fluorescent chemosensor, 2,2′-bipyridyl-3,3′-bis-(N,N′-disalicylidene)-formyhydrazone has been synthesized and characterized. Among the various metal ions, only Al3+ induces the fluorescence enhancement of the formylhydrazone and results in “OFF–ON” type sensing with excellent selectivity and high sensitivity in aqueous system. The lowest detection limit for Al3+ is 0.17 μM, which is much lower than the permissible concentration of Al3+ for drinking water in China. Also, the chemosensor can be applied to the monitoring of Al3+ ion in aqueous solution with a pH span 6–8. Furthermore, fluorescence microscopic imaging also indicates that the formylhydrazone chemosensor has the potential for the detection of Al3+ in the biological environment. [Copyright &y& Elsevier]

The probe H 2 L molecule has a good recognition ability for Al3+ ions. This probe molecule can also realize naked eye recognition of Al3+ under 365 nm UV light. It has the advantages of fast response speed, low detection limit and intuitiveness. • Salamo-based fluorescent chemosensor H 2 L detecting Al3+ and LOD was 5.98 × 10−9 M. • Fluorescence intensity of the probe obviously enhanced under UV and normal light. • Exogenous detection in zebraflsh of salamo-based probe gained satisfactory results. A new salamo-based probe H 2 L was synthesized and characterized by nuclear magnetic resonance, mass spectrometry and fluorescence spectroscopy. Compared with previous work of some other probes, the probe H 2 L can selectively recognize Al3+ in the fluorescence spectra and the detection limit is as low as 5.98 × 10−9 M. Beyond that, the color of solution becomes bright green under 365 nm UV light. Notably, under low concentrations, the probe can be used as a tool for exogenous detection of Al3+ in organisms. This result expands the application of salamo-based fluorescent probes in the field of biology. [ABSTRACT FROM AUTHOR]