Synthetic, spectral, thermal and powder X-ray diffraction studies of bis(O-alkyldithiocarbonato-S,S′) antimony(III) dialkyldithiocarbamates

• Antimony(III) bis(O-alkyldithiocarbonato-S,S′) dialkyldithiocarbamate complexes.
• Complexes have distorted geometry due to stereochemically active lone pair.
• Both the ligands show anisobidentate mode of binding with centre antimony metal.
• Thermal studies confirmed the last decomposition product as antimony sulfide.
• These complexes exhibited nanoranged particle size and monoclinic crystal system.

Compounds of antimony(III) with mixed sulfur donor ligands of the type [(ROCS2)2SbS2CNR′2] (where, R = C2H5, and iC3H7; R′ = CH3, C2H5, and CH2CH2) have been synthesized using anhydrous acetone as a solvent by the one pot reaction of antimony(III) tris(O-alkyldithiocarbonato-S,S′), antimony(III) chloride and sodium/ammonium salt of dialkyldithiocarbamate in 2:1:3 molar ratios. These compounds have been characterized by physicochemical [melting points, molecular weight determinations, elemental analyses (C, H, N, S, and Sb)], spectral [UV, IR, Far-IR and NMR (1H and 13C)] studies. In IR spectra strong band was observed at 1028–1051 cm–1 which indicates anisobidentate mode of bonding of both the ligands with antimony metal. NMR spectral data of these compounds show expected proton resonance due to corresponding moieties. The powder XRD, ESI-Mass and thermal (TG and DTA) studies have also been performed to get the information about geometrical parameters, fragmentation pattern and last thermal decomposition product, respectively. The powder XRD studies lead to the structural properties of the synthesized compounds and show the nanorange crystallite size and monoclinic crystal system. Thermal data of these compounds indicate the formation of antimony sulfide (Sb2S3) as a final thermal degradation product which is used in a number of ways like switching devices television cameras and microwave devices.

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