Oxidizing Rhodium with Sulfuric Acid: The Sulfates Rh 2 (SO 4 ) 3 and Rh 2 (SO 4 ) 3 ·2H 2 O
| Autor: | Mathias S. Wickleder, Stefan Schwarzer, Annika Betke, Christian Logemann |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Inorganic chemistry Thermal decomposition chemistry.chemical_element Infrared spectroscopy Sulfuric acid 010402 general chemistry 01 natural sciences 0104 chemical sciences Rhodium Inorganic Chemistry chemistry.chemical_compound chemistry X-ray crystallography Orthorhombic crystal system Sulfate Powder diffraction Nuclear chemistry |
| Zdroj: | European Journal of Inorganic Chemistry. 2017:752-758 |
| ISSN: | 1099-0682 1434-1948 |
| Popis: | The reaction of elemental rhodium and concentrated sulfuric acid (97 %) at 400 °C leads to red plate-shaped single crystals of Rh2(SO4)3 [trigonal, R3, Z = 6, a = 806.8(1) pm, c = 2204.8(4) pm, V = 1242.8(4) × 106 pm3]. The same reaction carried out at a temperature of 475 °C leads to orange crystals of Rh2(SO4)3·2H2O [orthorhombic, Pnma, Z = 4, a = 920.46(2) pm, b = 1244.47(3) pm, c = 833.37(2) pm, V = 954.61(4) × 106 pm3]. Thermal analysis and X-ray powder diffraction measurements were performed to investigate the decomposition and resulting residues of the compounds. For both compounds the decomposition occurs through two steps and is finished at around 1000 °C at the stage of elemental rhodium. Additionally both sulfates were characterized by means of IR spectroscopy. |
| Databáze: | OpenAIRE |
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