Direct Electrochemical Synthesis of Nickel (II) Thiolates and their Coordination Complexes.

Baljit Singh,Shavina Shavina

doi:10.24297/jac.v11i9.2688

Abstract

Metallo organic compounds can be synthesized electrochemically by anodic generation of metal cations by using sacrificial metal anode. Bis-thiolates complexes of Nickel, Ni(SR)2 have been prepared in an H-type cell by electrochemical oxidation of thiols RSH (ethanethiol, 2-propanethiol, 1-butanethiol, 1-pentanethiol and thiophenol) with sacrificial Nickel (Ni) anode and inert Platinum (Pt) cathode in non-aqueous solution of acetonitrile containing tetrabutylammonium chloride (as supporting electrolyte). On refluxing with ligand (L) 2,2'-bipyridyl, these thiolates do not form coordination compounds. However, their adducts Ni(SR)2.L have been synthesized electrochemically by adding the ligand to above thiols in solution phase. All these synthesized complexes have been characterized by elemental analysis, infrared spectral data and other physical measurements. All these compounds are in the solid state with excellent yield and associated with high electrochemical efficiency.

Highlights

The complexes in which sulphur is the donor atom are of great interest because of importance of thiolate complexes in medicines[1,2], metalloproteins[3,4], catalyst[5] and chemical vapour deposition[6,7]
Electrochemical approach to synthesis has attracted a great deal of attention in organic[10,11,12], inorganic[1314], green[15] and nano chemistry[16,17,18], pharmaceutical[19] and chemical industries [11,20] etc
In the present context, we have extended the application of direct electrochemical synthesis for the preparation of simple bis-thiolato complexes of Nickel and their adducts with bidentate ligand 2,2'-bipyridyl by anodic dissolution of zero-valentcampact Nickel

Summary

INTRODUCTION

The complexes in which sulphur is the donor atom are of great interest because of importance of thiolate complexes in medicines[1,2], metalloproteins[3,4], catalyst[5] and chemical vapour deposition[6,7]. In the present context, we have extended the application of direct electrochemical synthesis for the preparation of simple bis-thiolato complexes of Nickel and their adducts with bidentate ligand 2,2'-bipyridyl by anodic dissolution of zero-valentcampact Nickel. This technique is simple, selective, efficient, one-step, eco-friendly and high yielding as compared to classical chemical techniques. Platinum (1.0×1.0 cm2) electrode was used as cathode and nickel rod (5cm, 0.623cm diameter) was used as sacrificial anode Both compartments were provided with two openings: one for guard tube and other for electrode. This magnitude of current efficiency is indicative of the anodic process that takes place

RESULTS AND DISCUSSION

CONCLUSION

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