Thiazole Schiff base turn-on fluorescent chemosensor for Al3+ ion

The thioazole Schiff bases L1 and L2 were prepaired. There fluorescence intensities are more than 50 fold enhanced immediately by mixing Al3+ in methanol solution. Fluorescence nature of the receptor-Al3+ complex goes to “turn-off” by addition of Ni2+ metal ions and EDTA. Sensors fluorescent nature also quenched in high acidic medium.