A versatile approach toward chemosensor for Hg2+ based on para-substituted phenylazocalix[4]arene containing mono ethyl ester unit

Add time:08/24/2019    Source:sciencedirect.com

In the present study, six new azocalix[4]arenes have been synthesized by reacting calix[4]arene with p-substituted aniline and ethyl bromoacetate. Characterization of these compounds has been used by elemental analyses, UV–Vis, FT-IR and 1H NMR spectroscopic studies. Their phase transfer studies have been performed by using liquid–liquid extraction procedure. With respect to the chromogenic behavior of hosts upon metal ion complexation, mono ethyl ester azocalix[4]arene derivatives have shown a significant selectivity toward Hg2+ and Hg+ over many other cations. It has been deduced that these new compounds are selective ionophores toward metal cations (Na+, K+, Sr2+, Ag+, Hg+, Hg2+, Co2+, Ni2+, Cu2+, Zn2+, Cr3+, Al3+ and La3+).

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