Syntheses of polystyrene supported chelating resin containing the Schiff base derived from salicylaldehyde and triethylene tetramine and its copper (II), nickel (II), cobalt (II), iron (III), zinc (II), cadmium (II), molybdenum (VI), zirconium (IV) & uranium (VI) complexes

Abstract

A new polymer-anchored chelating ligand has been synthesized by the reaction of chloromethylated polystyrene (containing 0.94 mmol of CI per gram of resin and 1 % cross-linked with divinylbenzene) and the Schiff base derived from salicylaldehyde and triethylenetetramine. A new series of polystyrene supported Cu(II), Ni(II), Co(lI), Fe(III), Zn(II), Cd(II), Zr(IV), dioxomolybdenum (VI) and dioxouranium (VI) complexes of the formulae PS-LCu, PS-LNi, PS-LCo, PS-LFeCI.DMF, PS-LZn, PS-LCd, PS-LZr(OH)2. DMF, PS-LMoO2 and PS-LUO2 (where PS-LH2 = polymer-anchored Schiff base and DMF = dimethylformamide) have been synthesized and characterised by elemental analysis, infrared, electronic spectra and magnetic susceptibility measurements. The complexes PS-LCu, PS-LNi and PS-LCo have square planar structure, PS-LFeCI.DMF, PSLMo02 and PS-LUO2 have octahedral structure, PS-LZn and PS-LCd are tetrahedral and PS- LZr(OH)2.DMF is pentagonal bipyramidal. The polymer-anchored Cu(II), Co(ll) and Fe(III) complexes are paramagnetic while Ni(II), Zn(II), Cd(II), Zr(lV), dioxomolybdenum(VI) and dioxouranium(VI) complexes are diamagnetic. The negative shift of the v (C = N) (azomethine) and the positive shift of v (C--O)(phenolic) are indicative of ONNO donor behaviour of the polymer-anchored Schiff base.