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  • Wiley-Blackwell  (2)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 419 (1976), S. 176-184 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of a New Isomeric Form of As4S4As4S4(II) was prepared by melting of the pure elements As and S in the atomic ratio 1:1 at the temperature range 500°-600°C and a quickly cooling to the room temperature. Yellow-orange coloured and very thin platy single crystals were recrystallized from a CS2 solution. The crystal parameters are: a = 11.193, b = 9.994, c = 7.153 Å and β = 92.8°. The space group in P21/n (No. 14).The molecule can be principally deduced from the As4-tetraedron. By the connection of the folded plane SAs3 to the platy pyramide S3As the cage structure of the As4S4(II) molecule will be built.
    Notes: As4S4(II) wird durch Zusammenschmelzen von elementarem As und S im Atomverhältnis 1:1 bei 500-600°C und schnelle Abkühlung erhalten. Aus der Lösung in CS2 rekristallisieren gelb-orangefarbene Einkristalle in Form von sehr dünnen Plättchen. Die Kristallparameter sind a = 11,193, b = 9,994, c = 7,153 Å, β = 92,8°; die Raumgruppe ist P21/n (Nr. 14).Das Molekül kann prinzipiell aus dem As4-Tetraeder abgeleitet werden. Ankopplung eines gewellten SAs3-Vierecks mit einer stumpfen S3As-Pyramide ergibt das Käfigmolekül As4S4 (II).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of CuAlInO4 - Structural and Spectroscopic Investigation on Compounds MIIMeIIIInO4 [MII: Mn2+ -Zn2+; MeIII: Al, Ga]A single crystal X-ray analysis of CuAlInO4 yielded a monoclinic structure [space group: Cm; am = 572.8(3) pm, bm = 330.9(2) pm, cm = 835.2(3) pm, β = 103.2(2)°; Z = 2], in which Cu2+ and Al3+ possess a distorted trigonal bipyramidal and In3+ an octahedral coordination. In hexagonal description the sequence of oxygen layers is ababcacabcbc with Cu2+ and Al3+ close to those layers, which have a hexagonal packing symmetry, and In3+ between layers of cubic packing sequence. Compounds MIIMeIIIInO4 (MII: Mg2+, Mn2+, Co2+, Cu2+ Zn2+; MeIII: Al3+, Ga3+) have the same structure. Ligand field and EPR spectroscopic results confirm the trigonal bipyramidal coordination of the transition metal ions. The stabilisation of the CuAlInO4- with respect to the spinel structure is discussed on the basis of site preference energies.
    Notes: CuAlInO4 (röntgenographische Einkristall-Strukturanalyse) kristallisiert monoklin [Raumgruppe: Cm; am = 572,8(3) pm, bm = 330,9(2) pm, cm = 835,2(3) pm, β = 103,2(2)°; Z = 2] mit (verzerrt) trigonal-bipyramidaler Koordination von Cu2+ und Al3+ und oktaedrisch koordinierten In3+-Ionen. In pseudohexagonaler Aufstellung (ah = 331 pm, ch = 2 439 pm) ist die Sauerstoff-Schichtenfolge ababcacabcbc mit Cu2+ und Al3+ in der Nähe der hexagonalen und In3+ zwischen den kubisch gestapelten Schichten.Den gleichen Gittertyp besitzen die Verbindungen MIIMeIIIInO4 (MII:Mg2+, Mn2+, Co2+, Cu2+ Zn2+; MeIII: Al3+, Ga3+). Die trigonal-bipyramidale Koordination der Übergangsmetallionen wird durch ligandenfeld- und EPR-spektroskopische Messungen bestätigt. Die Stabilisierung der CuAlInO4-im Vergleich zur Spinellstruktur durch 3dn-Kationen wird auf der Grundlage von „site-preference“-Energien diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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