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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1379-1383 
    ISSN: 0044-2313
    Keywords: Metallothermic Reductions ; Dibromides ; Diiodides ; Ternary Halides ; Neodymium ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallothermic Reduction of the Tribromide and -iodide of Neodymium with Alkali MetalsMetallothermic reduction (700-800°C, 2-3d, tantalum capsules) of NdX3 (X = Br, I) with an equimolar amount of alkali metal (A = Li—Rb) results in the case of lithium and sodium (except for the system Li/NdBr3) in the formation of the dihalides NdX2 (NdBr2 with the PbCl2-type, NdI2 with the SrBr2-type of structure). With A = K and Rb, KNd2Br5, RbNd2Br5, RbNd2I5 and “K8Nd7I25” are obtained. The first three crystallize with the monoclinic TlPb2Cl5-type (space group P21/c), the latter with the orthorhombic K2PrCl5-type of structure (space group Pnma) containing both Nd3+ and Nd2+.
    Notes: Die metallothermische Reduktion (700-800°C, 2-3d, Tantalampulle) von NdX3 (X = Br, I) mit äquimolaren Mengen an Alkalimetall (A = Li—Rb) führt im Falle von Lithium und Natrium (mit Ausnahme von NdBr3/Li) zu den Dihalogeniden NdX2 (NdBr2 im PbCl2-Typ, NdI2 im SrBr2-Typ). Bei der Umsetzung mit Kalium und Rubidium erhält man KNd2Br5, RbNd2Br5 bzw. RbNd2I5, die im monoklinen TlPb2Cl5-Typ (Raumgruppe P21/c) kristallisieren, sowie das isostrukturelle “K8Nd7I25”, das neben Nd2+ auch Nd3+ enthält und zum K2PrCl5-Typ gehört (orthorhombisch, Raumgruppe Pnma).
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1374-1378 
    ISSN: 0044-2313
    Keywords: Metallothermic Reduction ; Dibromides ; Diiodides ; Ternary Halides ; Dysprosium ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallothermic Reduction of the Tribromide and -iodide of Dysprosium with Alkali MetalsMetallothermic reduction (900-1000°C, 2-3 d, tantalum capsules) of DyX3 (X = Br, I) with alkali metals (A = Li—Cs) results in the case of lithium and sodium (except for the system DyBr3/Li) in the formation of the dihalides DyX2 (DyI2 with the CdCl2-type, DyBr2 with the SrI2-type of structure). The reduction of DyI3 with potassium leads to K1.71DyI4 which crystallizes hexagonally with a = 1 446.7(2) pm and c = 473.3(1) pm, space group P62m (Z = 3). In K1.71DyI4, [DyI6]-octahedra are edge-connected forming chains along [001] that are linked via K+. With A = K, Rb, Cs, variants of the perovskite-type of structure with the composition ADyX3 are obtained. They crystallize with the tetragonal NaNbO3-II-type (CsDyBr3) or with the orthorhombic GdFeO3-type of structure (KDyBr3, RbDyX3, CsDyI3).
    Notes: Bei der metallothermischen Reduktion (Tantalampulle, 900-1 000°C, 2-3 d) von DyX3 (X = Br, I) mit den Alkalimetallen (A = Li—Cs) erhält wird im Falle von Lithium und Natrium (außer im System DyBr3/Li) die Dihalogenide DyX2 (DyI2 im CdCl2-Typ, γyBr2 im SrI2-Typ). Die Reduktion von DyI3 mit Kalium führt zu K1,71DyI4, das hexagonal mit a = 1 446,7(2) pm, c = 473,3(1) pm, Z = 3 in der Raumgruppe P62m kristallisiert: [DyI6]-Oktaeder werden über Kanten längs [001] zu Ketten verknüpft, die durch K+-Ionen verbunden werden. Die Reduktion von DyBr3 mit Kalium, Rubidium und Caesium bzw. DyI3 mit Rubidium und Caesium führen zu Perowskitvarianten ADyX3, die bis auf CsDyBr3 (tetragonaler NaNbO3-II-Typ), im orthorhombischen GdFeO3-Typ kristallisieren.
    Additional Material: 1 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 7-12 
    ISSN: 0044-2313
    Keywords: Metallothermic Reduction ; Dibromides ; Diiodides ; Thulium ; Ytterbium ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallothermic Reduction of the Tribromides and -iodides of Thulium and Ytterbium with Alkali MetalsMetallothermic reduction of the trihalides MX, (M = Tm, Yb; X = Br, I) with equimolar amounts of alkali metal (A = Li—Cs; 700-800°C, 7 d, tantalum capsules) results in the formation of the dihalides MX, (MI, with the Cd1,-type of structure, MBr, with the SrI2- or α-PbO2-type of structure) in the case of lithium and sodium. With A = K, Rb, Cs variants of the perovskitetype structure with the composition AMX, are obtained. They crystallize with the undistorted cubic CaTiO3-type (CsYbBr3), with the tetragonal NaNbO3-11-type (CsTmBr3) or with the orthorhombic GdFeO3-type (CsMI3, RbMX3 and KMBr3). In KTmI, and KYbI3, corner- and edge-connected [MI6] octahedra form layers which are connected via K+ in analogy to a stuffed PuBr3- or the FeUS3-type structure (orthorhombic, Cmcm). Single crystals of Rb4YbI6 are obtained as a by product upon the reduction of YbI3 with rubidium. According to their K4CdCl6-type structure (trigonal, R3c), isolated [YbI6] octahedra are the main structural feature.
    Notes: Bei der metallothermischen Reduktion der Trihalogenide MX3 (M = Tm, Yb; X = Br, I) mit äquimolaren Mengen an Alkalimetall (A = Li—Cs; 700-800°C, 7 d, Tantalampullen) werden im Falle von Lithium und Natrium die Dihalogenide MX2 erhalten (MI2 im CdI2-Typ, MBr2 im SrI2-bzw. α-PbO2-Typ). Mit A = K, Rb, Cs entstehen Perowskitvarianten AMX3, die im unverzerrten kubischen CaTiO3-Typ (CsYbBr3), im tetragonalen NaNbO3-II-Typ (CsTmBr3) bzw. im orthorhombischen GdFeO3-Typ (CsMI3, RbMX3 und KMBr3) kristallisieren. Bei KTmI3 und KYbI3 treten ecken- und kantenverknüpfte [MI6]-Oktaeder auf, die Schichten bilden und durch K+ analog einer aufgefüllten PuBr3- bzw. der FeUS3-Struktur (orthorhombisch, Cmcm) zusammengehalten werden. Als Nebenprodukt bei der Reaktion von YbI3 mit Rubidium erhält man Einkristalle von Rb4YbI6 im K4CdCl6-Typ (trigonal, R3c), in dem isolierte [YbI6]-Oktaeder vorliegen.
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