Rhodium (Rh)

The rare transition metal rhodium was discovered by British chemist William Wollaston in 1803. It is used for hydrogenation catalysts, e.g. to produce cyclohexane derivatives from alkyl benzenes, or to reduce C=O’s to alcohols.

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Compound CAS Number Formula Metal ­­Cont. ­­approx. Color
Ammonium hexachlororhodate(III) 15336-18-2 (NH4)3[RhCl6] 27 % red-green
Hexaamminerhodium(III) chloride solution 13820-96-7 [Rh(NH3)6]Cl3 up to 2 % colorless
Hexaamminerhodium(III) hydroxide solution 146261-69-0 [Rh(NH3)6](OH)3 up to 8 % pale yellow
Rhodium(III) chloride 10049-07-7 RhCl3 49 % red
Rhodium(III) chloride hydrate 20765-98-4 RhCl3 · n H2O 38 % red
Rhodium(III) chloride solution 13569-65-8 RhCl3 up to 20 % red
Rhodium(III) nitrate hydrate 13465-43-5 Rh(NO3)3 · n H2O 40 % brown
Rhodium(III) nitrate solution 10139-58-9 Rh(NO3)3 up to 13 % brown
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