Abstract
A series of thiosemicarbazone derivatives of benzo-15-crown-5 were synthesized efficiently at room temperature using hydrogenchloride acid (HCl) as catalyst. Their anion recognition properties of a, b and c were studied, the result show they exhibit highly selective binding and sensing of F−, MeCO2 − and n-C3H7CO2 − in CH3CN (F− > n-C3H7CO2 − > MeCO2 − > > Cl−, Br− and I−). Especially receptor c shows different UV-Vis spectrum of F− from MeCO2 −and C3H7CO2 −, in addition to the color of the solution change from colorless to yellow upon the addition of F−, these two points make it suitable to be used as colorimetric anion sensor to identify fluoride anion from other halide anions and carboxylate anions by naked-eye. The connection between receptor and anion is by hydrogen bonding interactions, the binding ratio is 1:1, which have been confirmed by UV-vis inspection spectra in CH3CN and 1HMR in DMSO-d6.
Published Version
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