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  • 1970-1974  (3)
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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of Tetracäsium-μ-oxo-decachlordiosmate(IV), Cs4[Os2OCl10]The anhydrous binuclear complex Cs4[Os2OCl10] crystallizes with an orthorhombic unit cell, Pcab, a = 12.521, b = 13.994, c = 11.798 Å and Z = 4 formula units. The complex anion forms corner sharing octahedrons tetragonally deformed. The interatomic distances are Os — O = 1.778 Å and Os — Cl = 2.370 (4×) and 2.433 Å (1×) respectively. The Cs atoms are coordinated differently. The interatomic distances Cs — Cl range from 3.46 to 3.87 Å. The structure is discussed in connection with analogous complexes. Details of other polynuclear complexes of Os are added.
    Notes: Der wasserfreie Zweikernkomplex Cs4[Os2OCl10] kristallisiert orthorhombisch in Pcab mit a = 12,521 Å, b = 13,994 Å, c = 11,798 und Z = 4 Formeleinheiten. Die komplexen Anionen bilden gestreckte, eckenverknüpfte Oktaeder mit Sauerstoff als Brückenatom. Die Bindungsabstände betragen Os — O = l,778 Å und Os — Cl = 2,370 Å (4×) bzw. 2,433 Å (1×). Die Cs-Atonie sind unterschiedlich koordiniert. Die Abstände Cs — Cl liegen im Bereich von 3,46 bis 3,87 Å. Die Struktur wird im Zusammenhang mit analogen Komplexen diskutiert. Es werden Angaben zu weiteren Mehrkernkomplexen des Os gemacht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 400 (1973), S. 201-207 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Ba2CuF6 Structure; Correction and RefinementThe Ba2CuF6 structure was redetermined when superstructure reflexes were found. The compound crystallizes in the orthorhombic space group Bbam with a=5.937 Å, b=5.837 Å and c=15.852 Å (Z=4). The principle of the structure is as found before (1), but the copper coordination is changed decisive. Each copper atom is bonded by six fluorine atoms with the bond length 1.862 Å, 1.867 Å, 2.320 Å (2×), respectively, and has now an stretched octahedral coordination as expected. The difficulties with respect to the interpretation of absorption spectra are now removed.
    Notes: Nach dem Auffinden von Überstrukturreflexen wurde die Struktur von Ba2CuF6 neu bestimmt. Danach kristallisiert die Verbindung orthorhombisch (Bbam) mit a=5,937 Å, b=5,837 Å und c= 15,852 Å (Z=4). Während das Strukturprinzip erhalten bleibt(1), ist die Koordination der Cu-Atome entscheidend verändert. Jedes Cu-Atom ist an je zwei F-Atome im Abstand von 1,862 Å, 1,867 Å und 2,320 Å gebunden, erhält also wie erwartet eine gestreckt-oktaedrische Umgebung. Die bei der Deutung der Lichtabsorption aufgetretenen Schwierigkeiten sind damit beseitigt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Properties of the Blue Chromium(II) Chloride Tetrahydrate CrCl2.4H2OThe blue chromium(II) chloride tetrahydrate CrCl2. 4 H2O crystallizes monoclinic in the space group P21/c with a = 5.904, b = 7.339, c = 8.347 Å and β = 110.10°. The unit cell contains two isolated complexes in which the chromium atoms are coordinated by four short bonded water molecules with square planar configuration (Cr—O = 2.078 Å) and by two chlorine atoms in trans-configuration with long bonds (Cr—Cl = 2.758 Å). This structure may be described by the formula {[Cr(H2O)4]Cl2}. The absorption spectra are discussed on the basis of the structure determination.
    Notes: Das blaue Chrom(II)-chlorid-tetrahydrat CrCl2. 4 H2O kristallisiert monoklin in der Raumgruppe P21/c mit a = 5,904, b = 7,339, c = 8,347 Å und β = 110,10°. Die Elementarzelle enthält zwei isolierte Komplexe, in denen die Chromatome an vier planarquadratisch angeordnete, nahe benachbarte H2O-Molekeln (Cr—O = 2,078 Å) und an zwei transständige, weiter entfernte Cl-Atome (Cr—Cl = 2,758 Å) gebunden sind. Dieser Aufbau läßt sich mit der Formel {[Cr(H2O)4]Cl2} zum Ausdruck bringen. Die Lichtabsorption wird auf der Basis der Strukturbestimmung neu diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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