Rhodammonium Compounds. By S. M. JÖRGENSEN (J. pr. Chem. [2], 25, 346-348).— The author has prepared and cursorily examined some of the rhodammonium compounds, and has found them to be strictly analogous to the cobalt- and chrom-ammonium compounds.
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Rhodammonium Hydroxide, Rh₂(NH₃) ₁₀ (OH)₆, is obtained by warming rhodammonium chloride with water and silver oxide, and evaporating the solution.
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When the ammoniacal compound is mixed with excess ammonia and the solution filtered and concentrated, a yellow salt is obtained, which, on treatment with water, loses ammonium chloride and forms rhodammonium trichloride, 10NH₃Rh₂Cl₆.
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Other addition agents such as lead acetate and potassium dichromate, lead acetate and ammonium chloride, sodium thiosulphate with rhodammonium or with potassium dichromate and ammonium sulphate have been added
Source: wiktionary