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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1909-1914 
    ISSN: 0044-2313
    Keywords: Cu2Pt+IIPt3+IVS8; Copperthioplatinate(II,IV) ; mixed valent compounds ; crystal structure ; Rietveld refinement ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of Cu2PtIIPt3IVS8(NH4)2PtCl6 and Cu(CH3COO)2 were reacted at 380 K in a constant flow of H2S in the molar ratio of 2:1. Subsequent annealing of the product in sealed quartz glass ampoules in the presence of CuS as a buffer for the sulfur activity (temperature range 770 to 870 K) yields Cu2Pt4S8 as a polycrystalline, greyish black powder. Cu2Pt4S8 crystallizes in the space group P2/n (No. 13) with the cell parameters a = 10.6478(2), b = 6.9350(1), c = 6.7411(1) Å, β = 91.942(1), Z = 2. The structure determination and refinement were performed by the means of x-ray powder diffraction data of this first copperthioplatinate. There are no isotypic compounds known, so far. According to the characteristic coordination of the metals by sulfur, the oxidation states are Cu+I, Pt+II and Pt+IV, the compound may be formulated as Cu2Pt+IIPt3+IVS8. Cu2Pt4S8 exhibits diamagnetic and semiconducting properties.
    Notes: Die Umsetzung von (NH4)2PtCl6 und Cu(CH3COO)2 im molaren Verhältnis von 2:1 bei 380 K im H2S Strom, gefolgt von Tempern des Produktes in abgeschmolzenen Quarzglasampullen zwischen 770 und 870 K, in Gegenwart von CuS als Puffer für die Schwefelaktivität, ergibt Cu2Pt4S8 als polykristallines, grau-schwarzes Pulver. Cu2Pt4S8 kristallisiert in der Raumgruppe P2/n (Nr. 13) mit den Gitterkonstanten a = 10,6478(2), b = 6,9350(2), c = 6,7411(1) Å, β = 91,942(1), Z = 2. Die Strukturaufklärung und -verfeinerung erfolgten unter Verwendung von Röntgenpulverdaten dieses ersten Kupferthioplatinats. Isotype Verbindungen sind nicht bekannt. Nach der jeweils charakteristischen Umgebung durch Schwefel liegen Cu+I, Pt+II und Pt+IV gemäß Cu2Pt+IIPt3+IVS8 vor. Cu2Pt4S8 ist diamagnetisch und halbleitend.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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