Xanthate complexes mixed-ligands

As with earlier sections, there is a lack of structural data on binary xanthates for iron, ruthenium, and osmium, but there are a relatively large number of mixed-ligand complexes, particularly organometallic species. 

Of the transition metals, the nickel triad has been the most studied in terms of xanthate structures, especially nickel xanthates. Thus, binary xanthate structures are known for all elements with no less than 15 binary nickel xanthate structures known and these aggregate in the solid state in six distinct supramolecular architectures. There is also a rich diversity of adducts as well as mixed-ligand complexes, in particular for nickel. 

In general, the complexes are prepared by mixing aqueous or alcoholic solutions of the sodium, ammonium or potassium salt of the ligand and CrCl3-6H20, sometimes with Zn dust present.997,998 However, in some cases anhydrous conditions are necessary to prevent the formation of polymeric hydrolysis products,986 and dithiophosphate is much more resistant to temperature and extremes of pH than dithiocarbamate or xanthate. In the preparation of L3, where L is 4-aminophenazonedithiocarbamate, aqueous Cr(N03)3 was added to the reaction mixture from the preparation of the ligand.999... 

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