Abstract
The colorimetric chemosensor 2‐((3,5‐dichloro‐2‐hydroxybenzylidene)amino)‐3′,6′‐dihydroxy‐6‐methyl‐4‐(p‐tolyl)spiro[benzo[f]isoindole‐1,9′‐xanthen]‐3(2H)‐one (BFFSH) derived from benzo[f]fluorescein dye was synthesized. NMR and IR spectroscopy as well as mass spectrometry were used to confirm the compound. BFFSH shows potential application for detecting metal ions in aqueous solution. It displays a colorimetric selectivity and sensitivity towards the aqueous solution of Cu2+ ions with a detection limit in the nano‐molar range (1.69 nM). In addition, the application of BFFSH was extended for the detection of Cu2+ ions in real water samples (tap and synthetic water) with a high recovery percentage. Additionally, the association constant (Ka) of BFFSH, which binds with Cu2+ ions based on 2:1 stoichiometry was calculated.
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