Syntheses and characterization of coordination compounds of monobasic bidentate (NS donor) Schiff bases derived from aldehydopolystyrene and 2-aminoethanethiol or 2-aminothiophenol

Department of Chemistry, National Institute of Technology, Kurukshetra-136 119, India

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Manuscript received 6 January 2004, revised 27 April 2003. accepted 11 June 2004

Aldehydopolystyrene reacts with 2-aminoethanethiol or 2-aminothiophenol in 1 : 4.68 molar ratio to form polystyrene-anchored Schiff bases, PS-LH (1) or PS-L'H (2) respectively. PS-LH or PS-L'H reacts with metal salts in DMF to form the polystyrene-anchored coordination compounds, [PS-LM(CH₃COO)·DMF] (where M = Cu, Zn, Cd, UO₂ ), [PSLM'(CH₃COO)·3DMF] (where M' = Co, Ni), [PS-LFeCI₂·2DMF] and [PS-LMoO₂ (acac)] (where acacH = acetylacetone). PSL'H also forms the similar types of compounds. The polystyrene-anchored coordination compounds have been characterized on the basis of elemental analyses, IR, reflectance spectral and magnetic susceptibility measurements. The shifts of v(C=N) (azomethine), v(C-S) (thioalchoholic) or v(C-S) (lhiophenolic) stretches of 1 or 2 in coordination compounds indicate their monobasic bidentate (NS donor) behaviour. The polystyrene-anchored Co^II , Cu^II , Ni^II and Fe^llI compounds are paramagnetic, while others are diamagnetic. The Cd^II and Zn^II compounds are tetrahedral, Cu^II compounds are square planar, Co^II , Ni^II , Fe^llI, \(MoO_2^{VI}\) and \(UO_2^{VI}\) compounds arc octahedral. All the polystyrene-anchored coordination compounds are magnetically dilute in nature.