Synthesis and characterization of polystyrene-anchored monobasic bidentate Schiff base and its complexes with bi-, tri-, tetra- and hexavalent metal ions

A new monobasic bidentate ON donor Schiff base PS-LH2 (where PS-LH2 = polystyrene-anchored Schiff base obtained by condensation of chloromethylated polystyrene (containing 1.17 mmol of chlorine per gram of resin cross-linked with 2% divinylbenzene), 2-hydroxy-1-naphaldehyde and 4-aminosalicylic acid has been synthesized. PS-LH2 reacts with metal complexes to form polystyrene-anchored complexes: PS-LHM(CH(3)Coo) center dot DMF (where M = Cu, Zn, Cd, UO2), PS-LHZr(OH)(2)(CH(3)Coo) center dot 2DMF, PS-LHFeCl2 center dot 2DMF, PS-LHM'(CH(3)Coo) center dot 3DMF (where M' = Mn and Ni) and PS-LHMoo(2)(acac), where acacH = acetylacetone. The polystyrene-anchored complexes have been characterized by elemental analysis, IR, ESR and magnetic susceptibility measurements. The per cent reaction conversion of PS-LH2 to polystyrene supported coordination compounds lies between 30-95. Shifts of the azomethine nu(C=N) and phenolic nu(C-O) stretches are indicative of ON donor behaviour of the polystyrene-anchored ligands. The complexes, PS-LHCu(CH(3)Coo) center dot DMF, PS-LHFecl(2) center dot 2DMF, PS-LHMn(CH(3)Coo) center dot 3DMF and PS-LHNi(CH(3)Coo) center dot 3DMF are paramagnetic, while PS-LHZn(CH(3)Coo) center dot DMF, PS-LHCd(CH3COO) center dot DMF, PS-LHUo(2)(CH(3)Coo) center dot DMF, PS-LHZr(OH)(2)(CH3COO) center dot 2DMF and PS-LHMoO2(acac) are diamagnetic. The copper(II) complex exhibits a square planar structure, zinc(II) and cadmium(II) complexes have tetrahedral structures, nickel(II), manganese(II), iron(III), dioxomolybdenum(VI) and dioxouranium(VI) complexes have octahedral structure and zirconium(IV) complex is pentagonal bipyramidal.