Abstract
Two new salicylaldehyde Schiff base chemosensors have been synthesized. Their crystal structures, photophysical properties as well as recognition properties for Cu2+ ions have also been examined. Their absorption peaks exhibit obvious blue shift upon the addition of Cu2+ to a HEPES buffer–methanol (3:7, v/v) solution of the compounds. The compounds are found to be able to recognize Cu2+ ions with fluorescence turn-on response in aqueous solution owing to the hydrolysis of the hydrazone bond in the Schiff׳s base compounds induced by Cu2+ ions.
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