Oxidizing Rhodium with Sulfuric Acid: The Sulfates Rh
<sub>2</sub>
(SO
<sub>4</sub>
)
<sub>3</sub>
and Rh
<sub>2</sub>
(SO
<sub>4</sub>
)
<sub>3</sub>
·2H
<sub>2</sub>
O
作者:Stefan Schwarzer、Annika Betke、Christian Logemann、Mathias S. Wickleder
DOI:10.1002/ejic.201601247
日期:2017.1.18
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
元素铑与浓硫酸 (97 %) 在 400 °C 下反应生成红色板状 Rh2(SO4)3 [三角晶,R3,Z = 6,a = 806.8(1) pm,c = 2204.8(4) pm, V = 1242.8(4) × 106 pm3]。同样的反应在 475 °C 的温度下进行,得到 Rh2(SO4)3·2H2O 橙色晶体 [正交,Pnma,Z = 4,a = 920.46(2) pm,b = 1244.47(3) pm,c = 833.37(2) pm, V = 954.61(4) × 106 pm3]。进行热分析和 X 射线粉末衍射测量以研究化合物的分解和产生的残留物。对于这两种化合物,分解通过两个步骤进行,并在元素铑阶段在 1000 °C 左右完成。此外,两种硫酸盐均通过红外光谱表征。