Syntheses and metal ions recognition of dendritic calix[n]arenes (n = 6,8) amide derivative

Abstract

Dendritic p-t-butylcalix[n]arene amide derivatives with terminal amino groups of the first and second generations were synthesized by using divergent methods from ammonolysis of ethyl calixarylacetate with 1,6-diaminohexane and Michael addition of methyl acrylate. Their structures were confirmed by IR, ¹H NMR. The recognition properties of these amide derivatives for several kinds of metal ions were studied with UV Vis spectroscopy. The results showed a great affinity for soft Ag⁺ and UO₂²⁺ ions and formed 1:2 or 1:3 stoichiometric complexes.