Synthesis,X-ray Structure and Anion Binding Properties of the Novel Urea Derivatives of Calix[4]arene Dimer

摘要

Selective complexation of anions is more demanding than that of cations due to the many reasons such as size,charge density,polarizability,solvation energy and pH-dependent acid-base equilibria.Anion plays a fundamental role in a wide range of chemical and biological processes,and numerous efforts have been devoted to the development of abiotic receptors for anion species,but they are still very limited.