| Abstrakt: |
Two new iodobismuthates with the composition LnBiI•13HO (Ln = La, Nd) were synthesized and their crystal structures were determined. The compound LaBiI•13HO crystalizes in the orthorhombic space group Pna2, a = 24.206(5), b = 8.405(1), c = 26.360(5) Å; the compound NdBiI•13HO crystalizes in the monoclinic space group P2/ 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(HO) and the anions BiI 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. [ABSTRACT FROM AUTHOR] |
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