Synthesis and Characterization of a Carbazole-Based Schiff Base Capable of Detection of Al3+ in Organic/Aqueous Media.

A new fluorescence probe (L) selectively detecting Al3+ ions was synthesized via the condensation reaction, and characterized using UV-Vis, FT-IR, 1H-NMR and 13C-NMR spectroscopic techniques. The limit of detection for Al3+ ions of this synthesized probe was found to be 9.29 × 10-7 M, while the Ka constant value was determined to be 1.64 × 104 M-1. The stoichiometric binding ratio of L-Al3+ was found to be 2:1 using the Job's plot method, and this ratio was also confirmed by 1H-NMR titration and mass spectrometry. The recyclability of the chemosensor was found by the fluorescence method through the addition of EDTA to the L-Al3+ solution. The obtained data showed that the carbazole-based Schiff base acted as an ideal chemosensor for Al3+. Carbazole-based Schiff base as a fluorescent sensor for detection of Al3+ was synthesized and characterized. The association constant (Ka) was calculated to be 1.64 × 104 M-1 and the limit of detection (LOD) value was determined to be 9.29 × 10-7 M. It was determined that th Schiff base was bound to Al3+ ions in 2:1 stoichiometric ratio. In the presence of other competitive metal cations, the selectivity of sensor L to Al3+ was not significantly affected.