Add time:07/28/2019 Source:sciencedirect.com
A series of novel calix[4]arene hydrazone and semicarbazone based neutral receptors have been synthesized and characterized by IR, UV–vis, and NMR spectroscopies. The preliminary UV–vis and 1H NMR titration experiments revealed that 25,26,27,28-tetrapropoxycalix[4]arene tetra-semicarbazone can recognize H2PO4− through a 1:1 binding-stoichiometry in preference over other anions (Cl−, Br−, I−, HSO4−, ClO4−, and CH3COO−).
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