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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 59-64 
    ISSN: 0044-2313
    Keywords: Hexanuclear tantalum chloro cluster ; tantalum cluster hydroxide ; mixed coordinated clusters ; intercluster bridges ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Kristallstrukturen von trans-[Ta6Cl12(OH)4(H2O)2] · 10 H2O und (NMe4)2[Ta6Cl12(OH)6] · 21 H2ODie Verbindungen trans-[Ta6Cl12(OH)4(H20)2] · 10H2O 1, (NMe4)2[Ta6Cl12(OH)6] · 21H2O 2 und Na2[Ta6Cll2(OH)6] · 16H2O 3 enthalten oktaedrische Tantalchlorocluster und können aus alkalischer Lösung (Methanol/Wasser) erhalten werden. Die Strukturen von 1 und 2 werden beschrieben. Kristallographische Daten s. Abstract.Die Verbindung 1 enthält neutrale, gemischt-koordinierte trans-[Ta6Cl12(OH)4(H2O)2]- Einheiten mit Ta—OH- und Ta—OH2Abständen von 210,4(5) und 214,5(5) pm. Ein koordiniertes Wassermolekül eines Clusters und eine OH Gruppe eines benachbarten Clusters bilden H3O2--Brücken mit einem O … H—O-Abstand von 253,7(7) pm zwischen den beiden Clustern aus. Die zwölf Ta—Cl-Abstände liegen zwischen 244,1(2) und 245,2(2) pm. Die Struktur von 2 ist aus [Ta6Cl12(OH)6]2--Anionen, NMe4+-Kationen und über H-Brücken gebundenen Wassermolekülen aufgebaut.
    Notes: The compounds trans-[Ta6Cl12(OH)4 (H2O)2] · 10 H2O 1, (NMe4)2[Ta6Cl12(OH)6] · 21 H2O 2 and Na2[Ta6Cl12(OH)6] · 16 H2O 3 containing octahedral tantalum chloro clusters were isolated from alkaline methanol/water solutions of [Ta6Cl12]4+. Crystal structures were solved for 1 and 2. Crystal data: 1, monoclinic, space group P21/c (No. 14), a = 938.5(2) pm, b = 1220.3(2) pm, c = 1391.7(4) pm, β = 103.87(2)°, V = 1547.5(6) × 106 pm3, Z = 2; 2, rhombohedral, space group R3 (No. 148), a = 1201.4(2) pm, c = 3110.8(6) pm, V = 3888.5(12) × 106 pm3, Z = 3; 3, cubic F lattice, a = 1451(2) pm, V = 3055(13) × 106 pm3, Z = 4.The cluster in 1 contains the neutral, mixed-coordinated trans-[Ta6Cl12(OH)4 (H2O)2] cluster with Ta—OH and Ta—OH2 distances of 210.4(5) pm and 214.5(5) pm, respectively. One coordinated H2O molecule from one cluster and a coordinated OH- group from a neighbouring cluster form H3O2- intercluster bridges with the O … H—O distance 253.7(7) pm. Twelve Ta—Cl (bridging) distances range from 244.1(2) to 245.2(2) pm. The structure of 2 is built of [Ta6Cl12(OH)6]2- anions, NMe4+ cations and water molecules, the latter linked to the anions by hydrogen bonds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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