Oxidizing rhodium with sulfuric acid: The sulfates Rh2(SO4)3 and Rh2(SO4)3∙2H2O
Oxidation von Rhodium mit Schwefelsäure: Die Sulfate Rh2(SO4)3 and Rh2(SO4)3∙2H2O
Artikel in Fachzeitschrift › Forschung › begutachtet
Publikationsdaten
| Von | Stefan Schwarzer, Annika Betke, Christian Logemann, Mathias S. Wickleder |
| Originalsprache | Englisch |
| Erschienen in | European Journal of Inorganic Chemistry, None(3) |
| Seiten | 752-758 |
| Herausgeber (Verlag) | Wiley-Blackwell |
| ISSN | 1099-0682 |
| DOI/Link | https://doi.org/10.1002/ejic.201601247 |
| Publikationsstatus | Veröffentlicht – 2017 |
The reaction of elemental rhodium and conc. sulfuric acid (97%) at 400°C leads to red plate-shaped single crystals of Rh2(SO4)3 (trigonal, R-3, Z = 6, a = 8.068(1), c = 22.048(4) pm, V = 1242.8(4) Å3). 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) Å3). 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 via two steps and is finished around 1000 °C at the stage of elemental rhodium. Additionally both sulfates were characterized by means of IR spectroscopy.
