Synthesis and Anion Binding Properties of Diamide Derivatives ofp-tert-Butylcalix[4]arene

Abstract

Abstract Two novel calix[4]arene based anion receptors containing positively charged binding sites in combination with amide groups have been synthesized. Anion binding properties of these receptors towards H2PO4 − and HSO4 − ions were studied by 1H-NMR spectroscopy and the results reflected that receptor 5 selectively recognize H2PO4 − in preference to HSO4 − ions. The molar ratio and the association constants of the complexes were determined by using Job plots and a nonlinear least-squares fitting method, respectively. Keywords: Anion recognitionamidecalix[4]arenetetrabutylammonium salt Acknowledgement We thank the Research Foundation of Selcuk University, Konya-Turkey (BAP 09201094) for financial support of this work.