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The isostructural compounds K 2 ZrTe 3  and Rb 2 ZrTe 3  were obtained at 1000°C by reacting K 2 Te and Rb 2 Te with stoichiometric amounts of Zr and Te. The compounds are monoclinic, mP24, space group P2 1 /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 K 2 ZrTe 3  and R = 0.038 for 1131 Fo's for Rb 2 ZrTe 3 . The crystal structure is of a new type, characterized by infinite anionic chains,  1  ∞ -[ZrTe 3 ] 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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Komplexe Chalkogenide der IVa Metalle mit niedrigdimensionalen anionischen Partialstrukturen. Darstellung und Kristallstruktur von K 2 ZrTe 3  und Rb 2 ZrTe 3  / Complex Chalcogenides of the IVa Metals with Low Dimensional Anionic Partial Structures. Preparation and Crystal Structures of K 2 ZrTe 3  and Rb 2 ZrTe 3