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  • molybdenum halides, tungsten halides  (1)
  • structure elucidation  (1)
  • 1
    ISSN: 0044-2313
    Keywords: Tellurium polycations ; tellurium subhalides ; oxotetrahalogeno-metallates ; molybdenum halides, tungsten halides ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Modifizierte Tellursubhalogenide in dem neuen Strukturtyp [Te15X4]n[MOX4]2n (M = Mo, W; X = Cl, Br)Die Reaktionen von Te2Br mit MoOBr3, von TeCl4 mit MoNCl2/MoOCl3 und Tellur mit WBr5/WOBr3 führen zu schwarzen, nadelförmigen Kristallen von [Te15X4][MOX4]2 (M = Mo, W; X = Cl, Br). Die Kristallstrukturbestimmungen [Te15Br4][MoOCl4]2: monoklin, C2/m, a = 1595,9(4) pm, b = 403,6(1) pm, c = 1600,4(4) pm, β = 112,02(2)°; [Te15Cl4][MoOCl4]2: C2/m, a = 1535,3(5) pm, b = 402,8(2) pm, c = 1569,6(5) pm, β = 112,02(2)°; [Te15Br4][WOBr4]2: C2, a = 1592,4(4) pm, b = 397,5(1) pm, c = 1593,4(5) pm, β = 111,76(2)° zeigen, daß alle drei Verbindungen isotyp und aus eindimensionalen Strängen von ([Te15X4]2+)n und ([MOX4]-)n aufgebaut sind. Die Strukturen der kationischen Stränge sind eng verwandt mit den Tellursubhalogeniden Te2X (X = Br, I). Eine der beiden Reihen von Halogenatomen, welche die Bänder aus kondensierten Te6-Ringen überbrücken, ist abgespalten, zusätzlich ist eine Te-Position nur zu 75% besetzt, was zur Formel ([Te15X4]2+)n (X = Cl, Br) führt. Die anionische Teilstruktur besteht aus Tetrahalogenooxometallat-Ionen [MOX4]-, die über lineare O-Brücken zu polymeren Strängen verknüpft sind. Die Verbindungen sind paramagnetisch mit einem ungepaarten Elektron pro Metallatom, was die Oxidationsstufe +V anzeigt, und schwache Halbleiter.
    Notes: The reactions of Te2Br with MoOBr3, TeCl4 with MoNCl2/MoOCl3, and Te with WBr5/WOBr3 yield black, needle-like crystals of [Te15X4][MOX4]2 (M = Mo, W; X = Cl, Br). The crystal structure determinations [Te15Br4][MoOBr4]2: monoclinic, Z = 1, C2/m, a = 1595.9(4) pm, b = 403.6(1) pm, c = 1600.4(4) pm, β = 112.02(2)°; [Te15Cl4][MoOCl4]2: C2/m, a = 1535.3(5) pm, b = 402.8(2) pm, c = 1569.6(5) pm, β = 112.02(2)°; [Te15Br4][WOBr4]2: C2, a = 1592.4(4) pm, b = 397.5(1) pm, c = 1593.4(5) pm, β = 111.76(2)° show that all three compounds are isotypic and consist of one-dimensional ([Te15X4]2+)n and ([MOX4]-)n strands. The structures of the cationic strands are closely related to the tellurium subhalides Te2X (X = Br, I). One of the two rows of halogen atoms that bridges the band of condensed Te6 rings is stripped off, and additionally one Te position has only 75% occupancy which leads to the formula ([Te15X4]2+)n (X = Cl, Br) for the cation. The anionic substructures consist of tetrahalogenooxometalate ions [MOX4]- that are linked by linear oxygen bridges to polymeric strands. The compounds are paramagnetic with one unpaired electron per metal atom indicating oxidation state Mv, and are weak semiconductors.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0570-0833
    Keywords: clusters ; rhenium compounds ; structure elucidation ; tellurium compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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