Abstract
Chemosensor 1 has been synthesized via a one-pot synthetic route incorporating anthracene and azomethine (HCN) units acting as signaling and binding units, respectively. Chemosensor 1 offered selective colorimetric and fluorometric response towards Al3+ and Hg2+ ions among other cations in CH3OH. Solution of 1 in methanol exhibited a naked eye color transition from yellow to colorless on addition of Al3+ and Hg2+ ions. In case of emission experiments, non-fluorescent solution of 1 showed major enhancement in intensity giving blue fluorescence for both metal ions. The limits of detection were calculated to be 1.04 and 0.8 µM for Al3+ and Hg2+, respectively, using fluorescence titrations. Further, reduced form of Schiff base 1 (2) has also been synthesized in order to compare the importance of azomethine (HCN) and (H2CNH) moieties in selective coordination. However, the reduced analogue 2 did not exhibit selective detection towards any of the ions.
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