Cobalt xanthate structures

A variety of cobalt xanthate structures are available in the literature, including four binary xanthates and a large range of phosphine adducts. By contrast, only one rhodium structure is known and no structure is yet available containing iridium. 

Earlier structural studies of carbohydrates by CD involved introduction of suitable chromophores into the sugar molecule thereby affording derivatives which exibit Cotton effects. These include, among others, xanthates (4-8) or azides (9). Later it was found that some metal ions (10), i.e. copper (11,13), vanadate (14), chromium (15), molybdate (16-22), nickel (23) or cobalt (24,25) ions form complexes with carbohydrates, which show appreciable Cotton effects. 

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