Chalcogenides syntheses involving metals

Precipitative methods for metal sulphides were initially used by Brus and co-workers, in which they prepared CdS by reaction between cadmium sulphate and ammonium sulphide. Meanwhile, co-precipitation approach has been successfully applied to the synthesis of various metal chalcogenide particles involving metathesis reactions between metal and chalcogenide ions that instantaneously produce precipitates of metal (Zn, Cd, Fig, Pb, Sb, In, Ga, etc.) chalcogenides (Equation (]))... 

It seems useful to understand the mechanisms involved in the chemistry and in the electrochemistry of sulfur and polysulfides. During the last 10 years, more than 90 papers deahng with solvothermal synthesis of chalcogenides MxE or binary chalcogenides MxM Ez (E = S, Se, or Te) have been published. In a typical process, a metal and/or a metallic salt is heated in a solvent (benzene, toluene, pyridine, ethylenediamine, water, etc.) at 100-200 ° C in the presence of an excess of chalcogen (see for instance Ref. 125). These empirical syntheses would benefit from a sound understanding of the involved mechanisms. 

Substitution reactions involving silylated chalcogen reagents represent a powerful approach in metal-group-XVI cluster synthesis.Compounds such as E(TMS)2 and RE-TMS react readily with metal salts to form metal chalcogenide or chalcogenolate bonds (Equations (13)-(15)). The driving force for the reaction is the thermodynamically favorable formation of an X—Si bond and elimination of X-TMS (where X = halide, OAc, etc.). 

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