Rubidium germanium iodide
Chemical compound
From Wikipedia, the free encyclopedia
Rubidium germanium iodide is a ternary halide of rubidium and germanium, with the chemical formula RbGeI3. It is being considered as a potential counterpart to the toxic CH3NH3PbI3 for photovoltaic applications.[1]
| Identifiers | |
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3D model (JSmol) |
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| Properties | |
| GeI3Rb | |
| Molar mass | 538.811 g·mol−1 |
| Melting point | 61 °C (decomposes) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Properties
Rubidium germanium iodide is polymorphic with various distorted perovskite-like structures, reflecting the influence of the "non-bonding" pair of electrons on the centre of Ge2+.[2]: 376
At room temperature, rubidium germanium iodide has a black, cubic perovskite form; between -29 °C and -52 °C a black rhombohedral form; a bordeaux-red orthrhombic perovskite form between -52 °C and -92 °C; and a lemon-yellow orthorhombic form below -92 °C.[2]: 376–377
Preparation
Rubidium germanium iodide can be prepared by reacting germanium(II) hydroxide and rubidium iodide in hydroiodic acid:[2]: 377
- Ge(OH)2 + RbI + 2 HI → GeRbI3 + 2 H2O