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    Rubidium germanium iodide

    From Wikipedia - Reading time: 5 min
    Rubidium germanium iodide
    Identifiers
    3D model (JSmol)
    InChI
    • InChI=1S/Ge.3HI.Rb/h;3*1H;/q+2;;;;+1/p-3
      Key: BMENQWFJSMYCLV-UHFFFAOYSA-K
    SMILES
    • [Ge+2].[I-].[I-].[I-].[Rb+]
    Properties
    Chemical formula
    		 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).
    Infobox references

    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]

    Preparation[edit]

    Rubidium germanium iodide can be prepared by reacting germanium(II) hydroxide and rubidium iodide in hydroiodic acid:[2]

    Ge(OH)2 + RbI + 2 HI → GeRbI3 + 2 H2O

    Properties[edit]

    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+.[3]

    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.[4]

    References[edit]

    1. ^ Deepthi Jayan, K.; Sebastian, Varkey (2021-09-01). "Ab initio DFT determination of structural, mechanical, optoelectronic, thermoelectric and thermodynamic properties of RbGeI3 inorganic perovskite for different exchange-correlation functionals". Materials Today Communications. 28: 102650. doi:10.1016/j.mtcomm.2021.102650. ISSN 2352-4928.
    2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 377. ISBN 978-0-08-037941-8.
    3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 376. ISBN 978-0-08-037941-8.
    4. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 376–377. ISBN 978-0-08-037941-8.
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