Nitrosochlor-ruthenates

Ruthenium Nitrosotrihydroxide, Ru(NO)(OH)-, is readily obtained by addition of the requisite quantity of potassium hydroxide to a solution of potassium nitrosochlor-ruthenate, K2Ru(NO)Cl5 or 2KCl.Ru(N0)Cls, at the boiling-point. 

Potassium Nitrosochlor-ruthenate or Potassium Ruthenium Ni-trosochloride, 2KC1. RuCl3. XO or K2RuClsNO, is obtained by direct precipitation of concentrated solutions of potassium chloride and ruthenium nitrosochloride it also results on evaporation of mixed dilute solutions of the two substances.3 It yields black orthorhombic crystals which dissolve in water to a reddish violet solution. The aqueous solution is stable, its electric conductivity showing no alteration whatever after standing for two weeks. Its solution apparently contains three ions,4 namely, K , K and RuCls.XO". 

Caesium Nitrosochlor-ruthenate, Cs2RuC 5.NO, and its dihydraie, Cs2RuCl5.XO.2H2O are known. ... 

Rubidium Nitrosochlor-ruthenate, Rb2RuCl3.NO, is precipitated as a rather pale purple anhydrous salt on mixing concentrated solutions of rubidium chloride and ruthenium nitrosochloride.9 On recrystallisation from hot water very dark crystals are obtained. 

The salt yields orthorhombic crystals isomorphous with the corresponding nitrosochlor-ruthenate (see p. 150). It is very stable for a compound of osmium. Its aqueous solution is quite stable, and even nitric acid does not attack the salt as vigorously as usual. 

---