Abstract
Abstract A new senser Isatin-3-(7′-Methoxychromone-3′-methylidene) hydrazone based on chromone Schiff base was synthesized to detect Mg 2+ . The complexation behavior of chemosensor with different metal ions in ethanolic solution was studied on UV–vis absorption spectra and fluorescent spectra. Results showed that the chemosensor HL displayed a 70-fold fluorescence enhancement upon the addition of Mg 2+ due to the photo-induced electron transfer ( PET ) effect. On the other hand, metal ions except Mg 2+ did not cause significant change in either the absorption or the fluorescence spectrum of HL . In addition, HL showed a good selectivity to Mg 2+ over other metal cations, especially Ca 2+ , which often responds together with Mg 2+ . Therefore, HL can act as an efficient sensor for magnesium ion.
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