N-diethylaminosalicylidene based “turn-on” fluorescent Schiff base chemosensor for Al3+ ion: Synthesis, characterisation and DFT/TD-DFT studies

A Schiff base chemosensor (H3L) based on the 4-(N,N-Diethylamino)salicylaldehyde moiety has been synthesized and characterized using several spectroscopic techniques i.e. 1H-NMR, FT-IR, Mass and UV-visible. The chemosensor shows high selectivity for Al3+ ion through ‘turn-on’ cyan colour fluorescence over a variety of metal ions i.e. Ni2+, Zn2+, Cd2+, Mn2+ ions except Co2+, Cu2+ and Fe3+ ions. The chemosensor exhibits 20 fold intensity...