Synthesis and characterization of manganese(II), cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II), iron(III), zirconium(IV), dioxomolybdenum(VI) and dioxouranium(VI) coordination compounds of polystyrene-supported tridentate dibasic Schiff base derived from semicarbazide and 3-formylsalicylic acid

Abstract

Several new polystyrene-supported metal coordination compounds of the types: PS-LM·DMF (where M = Cu, Zn, Cd, MoO₂, UO₂), PS-LFeCI·2DMF, PS-LZr(OH)2·2DMF and PS-LM·3DMF (where M = Mn, Co. Ni) have been synthesized by the reaction of polystyrene-anchored Schiff base (PS-LH₂) (obtained by the reaction of chloromethylated polystyrene, semicarbazide and 3-formylsalicylic acid) with metal ions. The compounds have been characterized by elemental analysis, IR, reflectance, ESR spectral and magnetic susceptibility measurements. The shifts of the <i>v</i>(C=N)(azomethine), <i>v</i>(C-O) (phenolic) and <i>v</i>(C-O)(enolic) stretches of PS-LH₂ upon complexation indicate the tridentate (ONO donor) behaviour of PS-LH₂.The Mn(II), Co(II), Ni(II), Cu(II) and Fe(III) compounds are paramagnetic while others are diamagnetic. PS-LCu·DMF is square planar, PS-LM·DMF (M = Zn, Cd) is tetrahedral, PS-LMO₂·DMF (M = Mo, U), PS-LM·3DMF (M = Mn, Co, Ni) and PS-LFeCl·2DMF are octahedral, while PS-LZr(OH)₂·2DMF is pentagonal bipyramidal. The ESR and magnetic measurements data indicate the magnetically dilute nature of the metal centres.