| | 1 | Author
| Petra Lauxmann, Thomas Schleid | Requires cookie* | | | Title
| CsCu3Dy2S5 und CsCu3Er2S5 : Zwei isotype quaternäre Sulfide der Lanthanoide mit Kanalstrukturen CsCu3Dy2S5 and CsCu3Er2S5: Two Isotypic Quaternary Sulfides of the Lanthanides with Channel Structures  | | | | Abstract
| Orthorhombic single crystals of CsCu3 Dy2 S5 (a = 397.54(4), b = 1414.8(1), c = 1685.7(2) pm) and CsCu3 Er2 S5 (a = 394.82(4), b= 1410.9(1), c = 1667.2(2) pm; both Cmcm, Z = 4) are obtained as by-products (pale yellow or pink transparent needles) in attempts to synthesize CuMS2 (M = Dy and Er) through the oxidation of elemental copper, dysprosium and erbium, respectively, with sulfur (molar ratios: 1 :1 :2) in the presence of equimolar amounts of cesium chloride (CsCl) as fluxing agent at 900 °C within fourteen days from torch-sealed evacuated silica tubes. Their crystal structure contains octahedral [MS6]9~ units (d(M-S) = 269 -282 pm) which share edges and vertices to form layers ^ {(M 2 S5)4_} parallel (010). These are three-dimensional-ly interconnected along [010] by two crystallographically different Cu+ cations in tetrahedral coordination of S2_ anions (d(Cu-S) = 227 -269 pm) according to ^{(Cu^MtSs)-}. Thereby a likewise layered substructure 2,{(Cu3 S5)7 -} is formed parallel (010) by edge-and vertex-linking of all [CuS4]7~ tetrahedra. Large channels within the <£>{(Cu3 M2 S5)~ } network spread along [100] and suit well to take up the highly coordinated Cs+ cations, which are surrounded by eight plus one S2~ anions at distances between 340 and 358 pm (8 x) with the ninth ligand 420 -421 pm apart in the shape of (2+7)-fold capped trigonal prisms. | | | |
Reference
| Z. Naturforsch. 56b, 1149—1154 (2001); eingegangen am 27. August 2001 | | | |
Published
| 2001 | | | |
Keywords
| Copper, Lanthanides, Sulfides | | | |
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| ZNB-2001-56b-1149 | | | | Volume
| 56 | |
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