Silver(I) and mercury(II) ions have been found to produce color changes in solutions of cis-and /roraj'-dilhiocyanatoamininecobalt(III) salts and in the corresponding salts of chromiuin(III) similar to those already known for mono-tliiocvanatoaimninecobalt(III) salts with silver(I) ion. The nature and stability of the interaction species occurring in the solutions have been studied spectrophotometricully using the method of continuous variations. The effects of acidity and ionic strength were found to be as expected from the hydrolytic nature of the ions and the Debye-Hückcl theory. The effects of light and metal ions (viz., Ag(I) or Hg(II)) upon the stability of solutions of [ Co (NH3) 3 N" CS ] (NO3 )2 and [CrfNLDsNCS]-(NOsk, respectively, have been compared. The nature of the reaction and the identity of type established between the co bait and chromium series of complexes are used to infer that both series have the isothiocyanato structure.(27) K. Glen and W. Cuntze, Z. anorg. allgem Chan., 237, 187 (1938).Oak Ridge, Tenn.
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