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  • Caesium tetraoxoplumbate  (1)
  • Potassium and Rubidium Oxocadmates  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 118 (1987), S. 677-690 
    ISSN: 1434-4475
    Keywords: Potassium and Rubidium Oxocadmates ; Crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of K6[CdO4] and Rb2CdO2 has been determined from single crystal X-ray diffraction data and refined toR=0.058 (K6[CdO4]) andR=0.088 (Rb2CdO2). K6[CdO4] crystallizes hexagonal, space group P63mc with lattice constantsa=867.42 (6),c=665.5 (1) pm,c/a=0.767 andZ=2. It is isotypic with Na6[ZnO4]. Rb2CdO2 is orthorhombic, space group Pbcn witha=1045.0 (2),b=629.1 (1),c=618.3 (1) pm,Z=4, and crystallizes with the K2CdO2 structure type. The crystal structures can be deduced from the motif of a closest packed arrangement of O2− with hexagonal (K6[CdO4]) or cubic (Rb2CdO2) stacking. The tetrahedra occupied by Cd2+ are isolated (K6[CdO4]) or edge-shared (formation of infinite SiS2-like chains [CdO4/2]) (Rb2CdO2). The powder diffraction pattern of Rb6[CdO4] [a=906.6 (1),c=694.3 (1) pm] and Rb2Cd2O3 [a=642.6 (2),b=679.0 (1),c=667.9 (2) pm, β=115.2 (1)] confirm isotypie with K6[CdO4] and K2Cd2O3 respectively.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 612 (1992), S. 143-148 
    ISSN: 0044-2313
    Keywords: Caesium tetraoxoplumbate ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Correction of the Crystal Structure of “Cs4PbO3” and the Structural Relationship between the Modifications of Cs4PbO4The compound that has been described as Cs4PbO3 really is Cs4PbO4. It does not crystallize in the space group P21, as assumed, but in P21/c. The observed fictitiuous violation of the extinction law for the c glide plane is due to twinning. The structure was refined using the original data as well as new data from an untwinned crystal. The denomination β-Cs4PbO4 is used to distinguish this structure from another known modification (α-Cs4PbO4). Both structures, α-Cs4PbO4 and β-Cs4PbO4, can be derived from the sphere packing of γ-plutonium when certain voids in its packing are occupied with oxygen atoms.
    Notes: Bei der früher als Cs4PbO3 beschriebenen Substanz handelt es sich tatsächlich um Cs4PbO4. Dieses kristallisiert nicht, wie angenommen, in der Raumgruppe P21, sondern in P21/c. Die beobachtete scheinbare Verletzung des Auslöschungsgesetzes für die c-Gleitspiegelebene ist auf Verzwillingung zurückzuführen. Die Struktur wurde sowohl mit den ursprünglichen Daten wie auch mit neuen Daten eines unverzwillingten Kristalls verfeinert. Die Bezeichnung β-Cs4PbO4 dient zur Unterscheidung von einer bereits bekannten Modifikation (α-Cs4PbO4). Beide Strukturen, α-Cs4PbO4 und β-Cs4PbO4, lassen sich von der des γ-Plutoniums ableiten, wenn bei dieser bestimmte Lücken mit Sauerstoffatomen besetzt werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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