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  • Oxonium fluoro aluminate  (1)
  • ammonium hexaquo chromate pentafluoride  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 613 (1992), S. 108-112 
    ISSN: 0044-2313
    Keywords: Ammonium aquapentafluoro chromate ; ammonium hexafluoro chromate ; ammonium hexaquo chromate pentafluoride ; thermal decomposition; thermal analysis ; i. r. ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Thermal Decomposition of Ammonium Fluoro ChromatesThe thermal decomposition of the ammonium fluoro chromates (NH4)2[CrF5(H2O)], (NH4)3CrF6, and (NH4)2[Cr(H2O)6]F5 has been investigated by thermoanalytical and X-ray investigations. Steps of decomposition are the formation of (NH4)3CrF6 und NH4CrF4. Further the formation of a chromium fluoride ammoniate CrF3 · xNH3 (x ≥ 1) has been detected. The end product of decomposition is the rhomboedrical CrF3. The hydrolysis reactions have been suppressed by using quasi-isobaric conditions. As by-reaction a partial reduction of CrF3 has been detected leading to the formation of Cr2F5.
    Notes: Die thermische Zersetzung der Ammoniumfluorochromate (NH4)2[CrF5(H2O)], (NH4)3CrF6 und (NH4)2[Cr(H2O)6]F5 wird thermoanalytisch und röntgenographisch untersucht. Die Zersetzung verläuft in jedem Falle über (NH4)3CrF6 und NH4CrF4. Außerdem wird die Bildung eines Chromfluorid-Ammoniakats CrF3 · xNH3 (x ≥ 1) nachgewiesen. Endprodukt der Zersetzung ist rhomboedrisches CrF3. Hydrolysereaktionen können durch Anwendung quasi-isobarer Bedingungen weitestgehend unterdrückt werden. Als Nebenreaktion wird eine partielle Reduktion von CrF3 nachgewiesen, die zur Bildung von Cr2F5 führt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1991-1996 
    ISSN: 0044-2313
    Keywords: Oxonium fluoro aluminate ; oxonium fluoro ferrate(III) ; diethylenediammonium fluoro metallates(III) ; crystal structure ; FTIR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Crystal Structure, and FTIR Spectra of the Oxoniumfluorometallates DienH2(H3O)[AlF6] and DienH2(H3O)[FeF6]Single crystals of the compounds DienH2(H3O)[AlF6] and DienH2(H3O)[FeF6] (Dien = Diethylenediamine or Piperazine) were obtained from aqueous HF solution. The compounds are isotypic and crystallize in the monoclinic space group P21/c, Z = 8 with the unit cell parameters a = 1333.7(3), b = 1261.8(3), c = 1234.5(2) pm, β = 115.79(3)° (Al compound) and a = 1354.0(3), b = 1267.5(3), c = 1255.9(3) pm, β = 115.48(3)° (Fe compound).The crystal structure consists of isolated [MF6]3- anions, H3O+ and DienH22+ cations. The [MF6]3- octahedra are connected via very strong O—H … F and N—H … F-bridges forming a three dimensional network structure. This strong hydrogen bonding was confirmed by the FTIR spectra.
    Notes: Einkristalle der Verbindungen DienH2(H3O) · [AlF6] und DienH2(H3O)[FeF6] (Dien = Diethylendiamin bzw. Piperazin) wurden aus wäßriger HF-Lösung erhalten. Die Verbindungen sind isotyp und kristallisieren monoklin in der Raumgruppe P21/c, Z = 8 mit den Gitterkonstanten a = 1333,7(3), b = 1261,8(3), c = 1234,5(2) pm, β = 115,79(3)° (Aluminiumverbindung) und a = 1354,0(3), b = 1267,5(3), c = 1255,9(3) pm, β = 115,48(3)° (Eisenverbindung). Die Struktur besteht aus isolierten [MF6]3--Anionen sowie H3O+- und DienH22+-Kationen. über zahlreiche sehr starke O—H … F sowie N—H … F-Brücken werden die [MF6]3--Oktaeder zu einem dreidimensionalen Netzwerk verknüpft. Diese H-Brücken-Vernüpfung spiegelt sich auch in den FTIR-Spektren wider.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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