Synthesis and Characterisation of some tin(IV) and Methyltin(IV) Complexes with Oximes and Related Schiff's Base Ligands

Abstract

A variety of heteroleptic complexes of the type [Sn(acac)2Cl2- n(L) n] [where L = {O(CH2)3N=C(Me)Ar} and {ON=C(R)Ar}; R = Me, H; Ar = 2–C5H4N, 2–C4H3O or 2–C4H3S; n = 1 or 2] have been synthesised in quantitative yields by the metathetical reaction of cis-[Sn(acac)2Cl2] with the sodium salt of the ligands in anhydrous methanol–benzene mixture. Corresponding bis(acetylacetonato)methyloximatotin(IV) complexes have also been prepared by a similar reaction of cis-[Sn(acac)2IMe] with the potassium salt of the oximes. Absence of any significant shift in the hetero-aryl ring carbon/proton resonances of all the derivatives of internally functionalised ligands indicates non-participation of the hetero-atom of the ring on coordination to the tin atom. Spectroscopic data suggest retention of the cis-octahedral configuation for all these derivatives. Hydrolysis of [Sn(acac)2{ON=C(Me)C4H3O}Cl], followed by sintering at 650°C yielded pure SnO2 microcrystals, which were characterised by XRD and SEM analyses.