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  • 1
    ISSN: 0044-2313
    Keywords: Rare Earths ; Bromides ; Copper ; Synthesis ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of (NH4)3Cu4Ho2Br13. Further Bromides of the (NH4)3Cu4M2Br13 Type (M = Dy—Lu, Y) and on Rb3Cu4Ho2Br13Single crystals of (NH4)3Cu4Ho2Br13 were obtained for the first time from the reaction of CuBr with HoBr3 which was contaminated with NH4Br: cubic, space group Pn3, Z = 2, a = 1101.71(5) pm. The crystal structure may be considered as a variant of the fluorite type according to [(HoBr6)4][(NH4)6(Cu4Br)2] ≡ Ca4F8. Pure products can be prepared from the binary halides in glass ampoules at 350°C. The bromides (NH4)3Cu4M2Br13 (M = Dy—Lu, Y) and Rb3Cu4Ho2Br13 are isotypic with (NH4)3Cu4Ho2Br13.
    Notes: Einkristalle von (NH4)3Cu4Ho2Br13 wurden erstmals bei der Reaktion von CuBr mit HoBr3, das mit NH4Br „verunreinigt“ war, erhalten: kubisch, Raumgruppe Pn3, Z = 2, a = 1101,71(5) pm. Die Kristallstruktur ist gemäß [(HoBr6)4][(NH4)6(Cu4Br)2] ≡ Ca4F8 als eine Variante des Flußspat-Typs aufzufassen. Reine Produkte können aus den binären Halogeniden bei 350°C in Glasampullen dargestellt werden. Die Bromide (NH4)3Cu4M2Br13 (M = Dy—Lu, Y) und Rb3Cu4Ho2Br13 sind mit (NH4)3Cu4Ho2Br13 isotyp.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Lithium ; Rare Earth Halides ; Crystal Structures ; Ionic Motion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Halides of the A3MX6 Type. VI. Ternary Chlorides of the Rare-Earth Elements with Lithium, Li3MCl6 (M = Tb—Lu, Y, Sc): Synthesis, Crystal Structures, and Ionic MotionSingle crystal X-ray studies on the ternary chlorides Li3ErCl6, Li3YbCl6 and Li3ScCl6 show that they crystallize in three different structure types. Li3ErCl6 (trigonal, P3ml, Z = 3, a = 1117.7(2); c = 603.6(2) pm; the chlorides with M = Tb—Tm, Y are isotypic) and Li3YbCl6 (orthorhombic, Pnma, Z = 4, a = 1286.6(1); b = 1113.2(1); c = 602.95(8) pm; Li3LuCl6 is isotypic) have very similar structures that may be derived from hexagonal closest packings of chloride ions with the cations occupying octahedral holes in part statistically. Li3ScCl6 (monoclinic, C2/m, Z = 2, a = 639.8(1); b = 1104.0(2); c = 639,1(1) pm; β = 109.89(1)°) crystallizes isotypic with Na3GdI6 and Li3ErBr6, structures that may be derived from a cubic closes packings of anions. The ionic movement in Li3YCl6 and Li3YbCl6 has been investigated by impedance and 7Li-NMR spectroscopy.
    Notes: Die ternären Chloride Li3ErCl6, Li3YbCl6 und Li3ScCl6 kristallisieren nach röntgenographischen Untersuchungen an Einkristallen in drei verschiedenen Strukturtypen. Li3ErCl6 (trigonal, P3ml, Z = 3, a = 1117,7(2); c = 603,6(2) pm; isotyp mit M = Tb—Tm, Y) und Li3YbCl6 (orthorhombisch, Pnma, Z = 4, a = 1286,6(1); b = 1113,2(1); c = 602,95(8) pm; Li3LuCl6 ist isotyp) haben sehr ähnliche Strukturen, die sich als hexagonal-dichteste Kugelpackungen von Chlorid-Ionen mit zum Teil statistischer Auffüllung der Oktaederlücken mit Kationen beschreiben lassen. Li3ScCl6 (monoklin, C2/m, Z = 2, a = 639,8(1); b = 1104,0(2); c = 639,1(1) pm; β = 109,89(1)°) kristallisiert isotyp mit Na3GdI6 und Li3ErBr6; die Anionen bilden hier eine kubisch-dichteste Kugelpackung. Die Ionenbewegung in Li3YCl6 und Li3YbCl6 wurde mittels Impedanzspektroskopie und 7Li-NMR-Spektroskopie untersucht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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