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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 527 (1985), S. 73-84 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On LaCo2P2 and Other New Compounds with ThCr2Si2- and CaBe2Ge2-Type StructureThe compounds MCo2P2 (M = La, Ce, Pr, Nd, Sm, Th, U), MFe2P2 (M = La, Ce, U), and ThCo2As2 were prepared for the first time. Structure determinations from single crystal X-ray data of LaCo2P2 (R = 0.011; 325 F-values), CeCo2P2 (R = 0.023; 160 F), PrCo2P2 (R = 0.044; 441 F), LaFe2P2 (R = 0.024; 511 F), and CeFe2P2 (R = 0.016; 183 F) with 11 variable parameters each resulted in atomic positions within the range of the ThCr2Si2-type. The powder patterns of ThCo2P2, and ThCo2As2 show superstructure reflections indicating a CaBe2Ge2-type structure. The other compounds can be assigned to the ThCr2Si2-type. Chemical bonding of these can be rationalized by a simple band structure model where bonding transition metal - transition metal interactions are important.
    Notes: Die Verbindungen MCo2P2 (M = La, Ce, Pr, Nd, Sm, Th, U), MFe2P2 (M = La, Ce, U) und ThCo2As2 wurden erstmals synthetisiert. Strukturbestimmungen aus Röntgen-Einkristalldaten von LaCo2P2 (R = 0,011; 325 F-Werte), CeCo2P2 (R = 0,023; 160 F), PrCo2P2 (R = 0,044; 441 F), LaFe2P2 (R = 0,024; 511 F) und CeFe2P2 (R = 0,016; 183 F) mit jeweils 11 variablen Parametern ergaben Atompositionen innerhalb der Breite des ThCr2Si2-Typs. Die Pulveraufnahmen von ThCo2P2, UCo2P2 und ThCo2As2 zeigen Überstrukturreflexe entsprechend der CaBe2Ge2-Struktur. Die übrigen Verbindungen können alle dem ThCr2Si2-Strukturtyp zugeordnet werden. Für diese Verbindungen wird ein einfaches Bandstrukturmodell diskutiert, bei dem bindende Wechselwirkungen zwischen den Übergangsmetallatomen eine wesentliche Rolle spielen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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