SYNTHESIS,CHARACTERIZATION AND STRUCTURE EFFECTS ON EXTRACTABILITY AND SELECTIVITY OF N,N'-BIS(SALICYLALDEHYDENE)- l,4-BIS-(m-AMiNOPHENOXY)BUTANE TOWARDS SOME DIVALENT CATIONS

摘要

The extraction of copper(II),nickel(II)and cobalt(II)from the aqueous phase with N,N'-bis(salicylaldehydene)-1,4-bis-(m-aminophenoxy)butane(MAS),which was synthesized from 1,4-bis(m-aminophenoxy)butane and salicylaldehyde,was studied.Microanalytical data,elemental analysis,UV-visible 1H and 13C n.m.r.spectra and IR-spectra were used to confirm the structures.The extractability and selectivity of divalent cations were evaluated as a function of relationship between distribution ratio of the metal and pH or ligand concentration.Cu~(+2)showed the highest extractability and selectivity at pH 6.0,whereas Ni~(+2)and Co~(+2)showed at pH 9.2.The stoichiometrics of the compounds formed were estimated to be CuL,- CoL,NiL,where L is N,N'-bis(salicylaldehydene)-1,4-bis-(m-aminophenoxy)butane.It was concluded that MAS can effectively be used in solvent extraction of copper(II),nickel(II)and cobalt(II)from the aqeous phase to the organic phase.