Coordination compounds of polystyrene-supported azo dye

Department of Chemistry, National Institute of Technology, Kurukshetra-136 119, Haryana, India
E-mail : dkumar_nitk@yahoo.com; arunsyamal@yahoo.co.in;
              jaipal_ nitk@rediffmail.com; praveen _gemini@yahoo.com
Manuscript received 7 January 2005, revised 20 December 2006, accepted 3 January 2007

Chloromethylated polystyrene (PSCH₂-CI) reacts with sodium 4-(1-hydroxy-2-naphthylazo)-3-hydroxy-7- nitronaphthalene-1-sulphonate in presence of ethyl acetate (EA) and triethylamine (TEA) to produce polystyrene-supported azo dye (PSCH₂-LH₂) (1). The latter reacts with Cu^II , ZnII , Cd^II, Co^II , Ni^II, Fe^III   Zr^Iv, MoO₂^vI_I and UO₂^vI ions to form [PSCH₂-LM·DMF] (where M = Cu^II , Zn^II , Cd^II , MoO₂^vI 1 , U011), [PSCH₂-LZr(OH)₂·2DMF], [PSCH₂-LFeCI·2DMF] and [PSCH₂-LM' ·3DMF] (where M' = Co^II, Ni^II). The complexes have been characterized on the basis of elemental analyses, spectral (infrared, reflectance, ESR) and magnetic susceptibility measurements. The negative shift of v(N = N) (azo) and the positive shift of v(C-O) (phenolic) stretches are indicative of the ONO donor behaviour of I. [PSCH₂-LCu·DMF] is square planar; [PSCH₂-LZn·DMF] and [PSCH₂-LCd·DMF] are tetrahedral; [PSCH₂-LMoO₂·DMF], [PSCH₂ LUO₂·DMF], [PSCH_z-LFcCI·2DMF], [PSCH₂-LCo·3DMF], [PSCH_z-LNi·3DMF] are octahedral and [PSCH₂-LZr(OH)₂·2DMF] is pentagonal bipyramidal.