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  • 1
    ISSN: 0044-2313
    Keywords: Pentastrontium-trifluoride-{di-μ-fluoro-bis[tetrafluoroferrate(III)]}-hemafluoroferrate(III), Sr5F3[Fe2F10][FeF6] ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dinuclear Anion Groups [Fe2F10]4- in the Crystal Structure of Sr5Fe3F19At single crystals of Sr5Fe3F19 a X-ray structure determination in the tetragonal space group 14/m was performed (a = 1429.4(3), c = 730.7(3) pm; Z = 4. wR = 0.019 for 502 independent reflections). Within the structure there are isolated, but disordered dimeric anion groups of edge-sharing octahedra [Fe2F10]4- (average Fe—F = 193.3 pm, Fe—Fe = 319.1 pm). They are embedded in a framework of strontium ions (C.N. 8-10) and single FeF63- octahedra (Fe—F = 191.0 resp. 192.7 pm, if corrected for thermal motion). The strong relations to the crystal structure of BaTiF5 and to further related fluoride compounds are discussed.
    Notes: An Einkristallen von Sr5Fe3F19 wurde eine röntgenographische Strukturbestimmung in der tetragonalen Raumgruppe 14/m durchgeführt (a = 1429,4(3), c = 730,7(3) pm; Z = 4. wR = 0,019 für 502 unabhängige Reflexe). In der Struktur treten isolierte, aber fehlgeordnete dimere Aniongruppen kantenverknüpfter Oktaeder [Fe2F10]4- auf (Mittelwert Fe—F = 193,3 pm, Fe—Fe = 319,1 pm). Sie sind eingebettet in ein Gerüst von Strontiumionen (KZ 8-10) und FeF63--Einzeloktaedern (Fe—F = 191,0 bzw. 192,7 pm, wenn für die thermische Schwingung korrigiert wird). Die engen Beziehungen zur Kristallstruktur von BaTiF5 und zu weiteren verwandten Fluorverbindungen werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Cyano-elpasolites ; bis(-tetramethylammonium) alkali hexacyanometallates ; preparation ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetragonal Cyano-Elpasolites: The Crystal Structures of [N(CH3)4]2KMn(CN)6 and [N(CH3)4]2RbCo(CN)6The tetragonal bis(-tetramethylammonium)-alkali-hexacyanometallates [N(CH3)4]2KMn(CN)6 (a = 884.8(2), c = 1222.2(6) pm) and [N(CH3)4]2RbCo(CN)6 (a = 884.7(1), c = 1233.1(2) pm) were prepared in the form of single crystals and their structures determined by X-ray methods (wR = 0.050 and 0.047 for 486 and 463 independent reflections, respectively; space group 14/m, Z = 2). The average distances in the resulting elpasolite structure, which is but slightly tetragonally distorted by small ferro-rotative displacements of the [M(CN6]3-) octahedra (Mn—C = 201.8, C—N = 115.6, K—N = 307.1 pm resp. Co—C = 190.7, C—N = 114.8, Rb—N = 320.1 pm), seem a bit enlarged if compared to related cyano complexes. Reasons for this are discussed using a tolerance factor concept for cyanoepasolites.
    Notes: Die tetragonalen Bis(-tetramethylammonium)-Alkali-Hexacyanometallate [N(CH3)4]2KMn(CN)6 (a = 884.8(2), c = 1222,2(6) pm) und [N(CH3)4]2RbCo(CN)6 (a = 884,7(1), c = 1233,1(2) pm) wurden in Form von Einkristallen dargestellt und röntgenographisch ihre Strukturen bestimmt (wR = 0,050 bzw. 0,047 für 486 bzw. 463 unabhängige Reflexe; Raumgruppe 14/m, Z = 2). Die mittleren Abstände in der resultierenden Elpasolithstruktur, die durch geringe ferrorotative Drehung der [M(CN)6]3--Oktaeder nur wenig tetragonal verzerrt ist (Mn—C = 201,8, C—N = 115,6, K—N = 307,1 pm bzw. Co—C = 190,7, C—N = 114,8, Rb—N = 320,1 pm), erscheinen leicht vergrößert im Vergleich zu Werten die in verwandten Cyanokomplexen beobachtet wurden. Gründe dafür werden im Rahmen einer Toleranzfaktorbetrachtung für Cyano-Elpasolithe diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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