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  • 1
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von SnTl4Se3 mit einer Anmerkung zu TlSe (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1073-1080 
    Details
    ISSN: 0044-2313
    Keywords: Selenides ; Cr5B3 type, In5Bi3 type, TlSe type ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of SnTl4Se3 with a Note on TlSeWe describe the preparation and crystal structure of SnTl4Se3. It crystallizes as a low symmetric distorted derivative with the In5Bi3 type of structure, which itself should be considered as a subfamily of the Cr5B3 type of structure: a = 852.2(2) pm, c = 1 272.2(6) pm, c/a = 1.49, Z = 4. Short Sn—Se distances of 311 pm, and 326 pm, respectively, are obtained in ∞1[SnSe2/2] chains running along [001]. Furthermore, short Tl—Se distances are found in quasimolecular bent moieties Tl2Se: 300 pm, 313 pm, and 347 pm, respectively. SnTl4Se3 is a semiconductor. The conductivity of some closely related phases are also reported.Finally, the structure of the well known compound TlSe has been refined for the first time, in order to get some more information about Tl1+—Se distances for square-antiprismatic coordinated Tl1+ ions.
    Notes: Darstellung und Kristallstruktur von SnTl4Se3 werden beschrieben. Die Verbindung kristallisiert in der Raumgruppe P4/ncc als niedersymmetrische Verzerrungsvariante des In5Bi3-Typs, der selbst eine isopuntale Unterfamilie des Cr5B3-Typs ist: a = 852,2(2) pm, c = 1 272,2(6) pm, c/a = 1,49, Z = 4. Es treten kurze Sn—Se-Abstände in längs [001] verlaufenden ∞1[SnSe2/2]-Ketten (311 pm, 326 pm) und kurze Tl—Se-Abstände in quasimolekularen, gewinkelten Baugruppen Tl2Se auf (300 pm, 313 pm, 347 pm). Die Verbindung ist halbleitend; die Leitfähigkeiten einiger verwandter Verbindungen werden ebenfalls vorgestellt.Um Vergleichswerte für Tl1+-Ionen mit quadratisch-antiprismatischer Se-Koordination zu erhalten, ist die Struktur der bekannten Verbindung TlSe erstmals mittels Einkristallen verfeinert worden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200621
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  • 2
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Ca5Hg3 und Sr5Cd3Professor Heinrich Oppermann zum 60. Geburtstag gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1845-1849 
    Details
    ISSN: 0044-2313
    Keywords: Cr5B3 Type ; Ca5Hg3 ; Sr5Cd3 ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Ca5Hg3 and Sr5Cd3Both the incongruently melting compounds, Ca5Hg3 and Sr5Cd3, have been synthesized from stoichiometric amounts of the pure elements. They crystallize with the Cr5B3 type of structure: space group I4/mcm, Z = 4; Ca5Hg3 (Sr5Cd3): a = 818.9(1) (871.7(1)) pm, c = 1 470.1(3) (1 660.1(3)) pm, c/a = 1.80 (1.90), R = 2.33% (2.97%). The most remarkable fragments are dumbbells X2, which have interatomic distances only slightly longer than the sum of Pauling's covalent radii: Hg—Hg (Cd—Cd) = 306 (298) pm. The structure can be constructed by rhombic dodecahedra as the only constituent moieties. These rhombic dodecahedra are built up by eight Ca (Sr) atoms and six Hg (Cd) atoms and are furthermore centered by an additional Ca (Sr) atom. Along [001] the rhombic dodecahedra share common vertices, but along [110] they are interconnected via common triangular faces. This kind of face sharing is responsible for the short distances obtained between the polyhedra, which leads to the occurrence of the dumbbells mentioned above.
    Notes: Die inkongruent schmelzenden Verbindungen Ca5Hg3 und Sr5Cd3 werden aus stöchiometrischen Mengen der reinen Elemente hergestellt. Beide Verbindungen kristallisieren im Cr5B3-Typ: Raumgruppe I4/mcm, Z = 4; Ca5Hg3 (Sr5Cd3): a = 818,9(1) (871,7(1)) pm, c = 1 470,1(3) (1 660,1(3)) pm, c/a = 1,80 (1,90), R = 2,33% (2,97%). Das bemerkenswerteste Strukturmerkmal sind diatomare Hanteln der Minderheitskomponente mit Abständen Hg—Hg (Cd—Cd) von 306 (298) pm. Als strukturaufbauendes Polyeder kann man ein längs [001] gestrecktes Rhombendodekaeder aus acht Ca-(Sr-) und sechs Hg-(Cd-) Atomen wählen, das von einem zusätzlichen Ca- (Sr-) Atom zentriert wird. Die Rhombendodekaeder sind entlang [110] über einige ihrer Rhomben flächenverknüpft, wodurch sich zwei Rhombendodekaeder so nahe kommen, daß die erwähnten Hanteln ausgebildet werden können.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946201102
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