Abstract
Two new iodobismuthates with the composition LnBiI6•13H2O (Ln = La, Nd) were synthesized and their crystal structures were determined. The compound LaBiI6•13H2O crystalizes in the orthorhombic space group Pna21, a = 24.206(5), b = 8.405(1), c = 26.360(5) Å; the compound NdBiI6•13H2O crystalizes in the monoclinic space group P21/n, a = 14.553(3), b = 13.386(3), c = 27.541(6) Å, β = 92.80(3)°. In both crystal structures, the cations Ln(H2O)93+ and the anions BiI63– alternate, forming a NaCl-type structure, and the structures themselves differ in the arrangement of water of crystallization that leads to the formation of dissimilar systems of hydrogen bonds. Both compounds undergo decomposition when heated, which is accompanied first by a partial liberation of water molecule, followed by pyrohydrolysis to form oxoiodides LnOI as final solid products. According to optical measurements, the band gap of the obtained compounds was equal to 1.78 (La) and 1.71 (Nd) eV.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1196—1201, July, 2017.
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Yelovik, N.A., Shestimerova, T.A., Bykov, M.A. et al. Synthesis, structure, and properties of LnBiI6•13H2O (Ln = La, Nd). Russ Chem Bull 66, 1196–1201 (2017). https://doi.org/10.1007/s11172-017-1872-y
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DOI: https://doi.org/10.1007/s11172-017-1872-y