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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1639-1643 
    ISSN: 0044-2313
    Keywords: Lanthanoide chalcogenidehalides ; erbium selenidebromide ; erbium selenideiodide ; sodium erbium selenide ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structures of ErSeI and NaErSe2It is reported about attempts to synthesize lanthanoide selenidehalides of the formula LnSeX (X = Cl, Br, I) exemplary for Ln = Er. The relative stabilities of these compounds are discussed. X-ray crystal structure analysis revealed for the compounds ErSeBr and ErSeI the FeOCl-structure type (space group Pmmn, Z = 2, a = 406.3(5) pm, b = 559.2(6) pm, and c = 795(1) pm, and a = 418.26(6) pm, b = 558.4(1) pm, and c = 889.0(2) pm, respectively). A corresponding chloride was not found within the scope of this investigation. From the educts Er2Se3 and ErCl3 in the presence of NaCl as flux in Nb-ampoules the compound NaErSe2 was formed instead which crystallizes in an α-NaFeO2-type structure (space group R3m, Z = 3, a = 408.41(2) pm and c = 2067.4(2) pm).
    Notes: Berichtet wird über die Versuche zur Synthese von Lanthanoidselenidhalogeniden der Formel LnSeX (X = Cl, Br, I) am Beispiel Ln = Er. Die relativen Stabilitäten der angesprochenen Verbindungen untereinander werden diskutiert. Die Röntgenstrukturanalyse ergab für die Verbindungen ErSeBr und ErSeI den FeOCl-Strukturtyp (Raumgruppe Pmmn, Z = 2, a = 406.3(5) pm, b = 559.2(6) pm und c = 795(1) pm für X = Br und a = 418.26(6) pm, b = 558.4(1) pm und c = 889.0(2) pm für X = I). Ein entsprechendes Chlorid konnte im Rahmen dieser Untersuchungen nicht gefunden werden. Statt dessen bildete sich aus Er2Se3 und ErCl3 mit NaCl als Schmelzmittel in Nb-Ampullen die Verbindung NaErSe2, die im α-NaFeO2-Typ kristallisiert (Raumgruppe R3m, Z = 3, a = 408.41(2) pm und c = 2067.4(2) pm).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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