A highly selective fluorescent probe for Al3+ based on quinoline derivative

• The receptor HL shows 286-fold enhancement of fluorescence intensity in the present of Al3+.
• The detection limit of HL for Al3+ could reach at 10−7 M level.
• A new chemosensor for Al3+ via the photo-induced electron transfer effect have been reported.

A novel Schiff base fluorescent probe, 1-phenyl-3-methyl-5-hydroxypyrazole-4-carbaldehyde (2′-methylquinoline-4′-formyl) hydrazone (PMHCH), for selective detection of Al3+ has been designed and synthesized. Upon addition of various metal ions, the receptor only shows 286-fold enhancement of fluorescence intensity which might be attributed to a 1:1 stoichiometry between PMHCH and Al3+ and the photo-induced electron transfer progress in the present of Al3+ at 505 nm. More importantly, the detection limit of PMHCH for Al3+ could reach at 10−7 M level.

Possible PET process of HL.Figure optionsDownload as PowerPoint slide