Komplexe Chalkogenide der IVa Metalle mit niedrigdimensionalen anionischen Partialstrukturen. Darstellung und Kristallstruktur von K2ZrTe3 und Rb2ZrTe3 / Complex Chalcogenides of the IVa Metals with Low Dimensional Anionic Partial Structures. Preparation and Crystal Structures of K2ZrTe3 and Rb2ZrTe3
2014
Klepp, Kurt O. | Kolb, Andreas
The isostructural compounds K₂ZrTe₃ and Rb₂ZrTe₃ were obtained at 1000°C by reacting K₂Te and Rb₂Te with stoichiometric amounts of Zr and Te. The compounds are monoclinic, mP24, space group P2₁/c, Z = 4 with a = 9.089(3), b = 14.148(4), c = 6.986(3) Å, β = 105.90(1)° and a = 9.735(4), b = 14.300(7), c = 6.952(8) Å, β = 108.61(2)°, respectively. The crystal structure was determined from diffractometer data and refined to R = 0.030 for 1452 Fo's for K₂ZrTe₃ and R = 0.038 for 1131 Fo's for Rb₂ZrTe₃. The crystal structure is of a new type, characterized by infinite anionic chains, ¹∞-[ZrTe₃]²⁻ built up by octahedra sharing opposite faces which run along [001]. The mean Zr-Te bond lengths are 2.921 and 2.920 Å, respectively. The alkali cations separating the chains are characterized by two different - distorted octahedral and pentagonal bipyramidal - chalcogen environments.
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