Synthesis and Characterisation of Complexes of Copper(II), Nickel(II) and Cobalt(II) with a Schiff Base Derivative of p-tert-Butylcalix[4]Arene

Abstract

This article describes the synthesis of a Schiff base of p-terf-butylcalix[4]arene [H₂L] in which the Schiff base unit bridges two opposite hydroxy groups of p-tert-butylcalix[4]arene. The synthesis of H₂L has been achieved by refluxing p-tert-butylcalix[4]arene 1,3-diacetonyl (1) with 1,2-diaminoethane in ethanol. Metal-ligand (I : 1) complexes of this Schiff base with Co(II), Ni(II) and Cu(II) have been prepared fiom the corresponding metal nitrates. The complexes have been characterized on the basis of elemental analyses and spectral data. The complexing abilities of H₂L toward alkali [e. g. Li(I), Na(I), and K(I)] and transition metals [Co(II), Ni(II) and Cu(II)] have been determined by extraction studies.