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  • Oxocobaltate(III)  (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 597 (1991), S. 19-26 
    ISSN: 0044-2313
    Keywords: Oxocobaltate(III) ; lithium ; sodium ; preparation ; single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Na2Li3CoO4, the First Quaternary Oxocobaltate(III) of the Alkali MetalsFor the first time we obtained Na2Li3CoO4 by annealing intimate mixtures of Co3O4, Na2O2, and Li2O [Co : Na : Li = 1 : 2.2 : 10.1; 760°C; 21 d; Ag-tube] in form of transparent red single crystals. Structure Refinement [four-circle diffractometer data; AED2; MoKα-radiation; 1016 Io(hkl); R = 2.6%; Rw = 2.0%; space group Pnnm; Z = 4; a = 818.7(3), b = 799.4(2), c = 655.1(2) pm] confirms the isotypism to Na2Li3GaO4 [2] and Na2Li3FeO4 [3]. Mean Fictive Ionic Radii, MEFIR, Effective Coordination Numbers, ECoN, and the Charge Distribution were calculated. The isotypism of Na2Li3CoO4 and Na2Li3GaO4 is compared graphically.
    Notes: Erstmals wurde mit Na2Li3CoO4 ein quaternäres Oxocobaltat(III) der Alkalimetalle durch Tempern inniger Gemenge der Oxide Co3O4, Na2O2, und Li2O [Co : Na : Li = 1 : 2,2 : 10,1; 760°C; 21 d; Ag-Bombe] in Form transparenter roter Einkristalle dargestellt. Die Strukturaufklärung [Vierkreisdiffraktometerdaten; AED2; MoKα-Strahlung; 1016 Io(hkl); R = 2,6%; Rw = 2,0%; Raumgruppe Pnnm; Z = 4; a = 818,7(3), b = 799,4(2), c = 655,1(2) pm] belegt die Isotypie zu Na2Li3GaO4 [2] und Na2Li3FeO4 [3]. Mittlere Fiktive Ionenradien, MEFIR, Effektive Koordinationszahlen, ECoN, sowie die Ladungsverteilung wurden berechnet. Ein Isotypievergleich mit Na2Li3GaO4 erfolgt graphisch.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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