Methods Using Complexes with Sulfite or Thiosulfate Ion

1 Methods Using Complexes with Sulfite or Thiosulfate Ion 

Chan and Tobe obtained /rmw-forms of monocyano complexes, trans-[Coa(CN)-(en)2] (a = Cl , HjO and OH ), by the following reaction sequence  

These cis-complexes were all resolved into their optically active isomers, using ammonium (+)-bromocamphor-Tt-sulfonate as resolving agent. 

Siebert obtained pentaamminecyano complexes [CoCN(NH3)s]X2 (X = Cl , Br , NO3 , CIO4 or V2 SO ) by the following reactions  

Reaction i) giving an insoluble complex [Co(CN)(S03)(NH3)4] 2 H2O was used with referen to an earlier work . In reaction ii), the insoluble complex was dissolved in cone. H2SO4 at 0 °C, the solution was then poured into water, and cone. HQ was added to form the aqua complex [Co(CN)(NH3)4(H20)]a2. In reaction iii), the aqua complex was allowed to react with aqueous NH3, NH4Q and activated charcoal to prodw% [CoCN(NH3)5]Cl2 (in analogy to the re tion in the familiar method for [Co(NH3 ]Cl3). 

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