Synthesis and characterization of polystyrene-supported chelating resin containing an ON donor bidentate Schiff base and its copper(II), nickel(II), cobalt(II), iron(III), zinc(II), molybdenum(VI) and uranium(VI) complexes

Abstract

A new bidentate ON donor Schiff base supported on a polystyrene matrix has been synthesized by the reaction of aminomethylated polystyrene and hydroxyacetone. The chelating resin reacts with metal salt/metal complex and forms metal-bound polymers. The formulae of the metal-bound polymers are: PSLCu(CH₃COO)·S, PSLNi (CH₃COO)·3S, PSLCo(CH₃COO)·S, PSLFeCl₂·2S, PSLZn (CH₃COO)·S, PSLZnCl·S, PSLMoO₂(acac), and PSLUO₂(CH₃COO)·S (where PSLH = polymer-anchored ligand; S = ethanol or methanol and acac = deprotonated acetylacetone). The polymer-anchored complexes have been characterized by elemental analysis, IR and electronic spectra and magnetic susceptibility measurements. The negative shifts of the ν(CO) (alcoholic) and ν(CN) (azomethine) are indicative of the ON donor behaviour of the polymer-anchored ligand. The complexes PSLNi(CH₃COO)·3S, PSLCo(CH₃COO)·S, PSLFeCl₂·2S, and PSLCu(CH₃COO)₂·S are paramagnetic while PSLZn(CH₃COO)·S, PSLZnCl·S, PSLMoO₂(acac), and PSLUO₂(CH₃COO)·S are diamagnetic. The force constant and UO bond distance of the polymer-anchored uranium(VI) complexes are 7.03 mdyn/Å and 1.73 Å, respectively. The copper(II)- and cobalt(II)-bound polymers exhibit a square planar structure, nickel(II), iron(III), molybdenum(VI) and uranium(VI) complexes are octahedral, and zinc(II) complexes are tetrahedral.