Novel 4,5-diazafluorene-based Schiff base derivatives as Al3+ ions fluorescence turn-on sensors

• A new 4,5-diazafluorene-based chemosensor has been synthesized by Schiff base.
• The Schiff base exhibited turn-on fluorescent behavior with Al3+ ions in ethanol.
• The fluorescent responses could be detected by naked eye under UV-lamp.

A new 4,5-diazafluorene-based fluorescent chemosensor has been synthesized by Schiff base condensation of 9,9-bis(3-methyl-4-aminophenyl)-4,5-diazafluorene with salicylaldehyde. The interaction of Schiff base with different metal ions has been studied over UV–vis absorption spectra and photofluorescent spectra. The results were indicated that Schiff base exhibited turn-on fluorescent behavior with Al3+ ions in ethanol. Such fluorescent responses could be detected by naked eye under UV-lamp. The limit of detection was calculated to be 4.2 ppm by titration method.

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