Rhodium(III) perchlorate

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| ImageFile = Rh(aq)6(ClO4)3.svg

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| index1_label=anhydrous

| PubChem1 = 21688474

| InChI1=1S/3ClHO4.Rh/c3*2-1(3,4)5;/h3*(H,2,3,4,5);/q;;;+3/p-3

| InChIKey1 = LCAWZYUJRNVLIG-UHFFFAOYSA-K

| SMILES1 = [O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O.[Rh+3]

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|Section2={{Chembox Properties

| Formula = [Rh(H₂O)₆](ClO₄)₃

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| Appearance = yellow solid

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Rhodium(III) perchlorate refers to the inorganic compound with the formula Rh(H₂O)₆(ClO₄)₃. It is a hygroscopic yellow solid. It is the perchlorate salt of the tricationic aquo complex [Rh(H₂O)₆]³⁺. The compound is prepared by treating hydrated rhodium(III) chloride and perchloric acid at elevated temperatures:{{cite journal|journal=Journal of Inorganic and Nuclear Chemistry|volume=3|year=1957|pages=365–366|title=

The Preparation of Rhodium(III) Perchlorate Hexahydrate|first1=Gilbert H.|last1=Ayres|first2=John S.|last2=Forrester|doi=10.1016/0022-1902(57)80042-6}}

:[Rh(H₂O)₆]Cl₃ + 3 HClO₄ → [Rh(H₂O)₆](ClO₄)₃ + 3 HCl

The reaction of rhodium(III) hydroxide with concentrated perchloric acid also produce rhodium(III) perchlorate.Gilbert H. Ayres, John S. Forrester. The preparation of rhodium(III) perchlorate hexahydrate. Journal of Inorganic and Nuclear Chemistry, 1957. Vol.3, Iss.6, pp 365-366

: Rh(OH)₃ + 3 HClO₄ → Rh(ClO₄)₃ + 3 H₂O