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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1227-1231 
    ISSN: 0044-2313
    Keywords: TiF4 ; preparation, single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Titanium Tetrafluoride - a Surprising Simple Column StructureFor the first time single crystals of TiF4 have been obtained by solvothermal decomposition of (O2)2Ti7F30 in anhydrous HF. The colourless, transparent needles crystallize orthorhombic in spacegroup Pnma-D2h16 (No. 62) with a = 2 281.1, b = 384.8, c = 956.8 pm, Z = 12. The new type of structure is dominated by isolated columns of corner-linked TiF6-octahedra.
    Notes: Durch Solvothermalsynthese in wasserfreier HF gelang es endlich erstmals, TiF4 aus (O2)2Ti7F30 in Form solcher Einkristalle darzustellen, die eine Strukturbestimmung ermöglichten. Die farblosen, transparenten Nadeln kristallisieren in der Raumgruppe Pnma-D2h16 (Nr. 62) mit a = 2 281,1, b = 384,8, c = 956,8 pm, Z = 12. TiF4 bildet einen eigenen Strukturtyp, dessen charakteristisches Merkmal von einander isolierte, aus TiF6-Oktaedern aufgebaute Säulen sind (Kolumnarstruktur).
    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 417 (1975), S. 114-124 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Hydrolysis of Iron (III) Salt Solutions. II. Ageing of Hydrolysis ProductsThe long time ageing up to 15 years of the products obtained by alkalifying iron(III) chloride solutions to different neutralisation degrees has been studied. The concentration of the Fe3+ and the Cl- ions, the strength of the alkali, and the rate of its addition influence the results. Slow alkalifying produced up to 90% neutralisation β-FeOOH. The transformation of the amorphous iron(III) oxidehydroxide to β-FeOOH was promoted by a high concentration of the Cl- ions. When a large amount of amorphous iron(III) oxidehydroxide was formed, intimately intergrown crystals of α- and β-FeOOH resulted. On further ageing β-FeOOH transformed into α-FeOOH. At a degree of neutralisation of 95 and 100% transformation of the amorphous iron(III) oxidehydroxide into α-Fe2O3 occurred. The 100% neutralized precipitate, however, remained partly amorphous. Authors discuss the factors that determine very slow reactions leading to these results.
    Notes: Es wird über die Alterung (bis zu 15 Jahren) von Produkten berichtet, die durch Alkalisierung von Eisen(III)-chlorid-Lösung bis zu verschiedenen Neutralisationsgraden erhalten wurden. Die Konzentration an Fe3+- und Cl-_Ionen, die Alkalistärke und die Geschwindigkeit der Zugabe beeinflußten die Ergebnisse. Langsames Alkalisieren ergibt bis zu 90%iger Neutralisation β-FeOOH. Die Umwandlung des amorphen Eisen(III)-oxidhydroxids in β-FeOOH wird durch eine hohe Konzentration an Cl-_Ionen gefördert. Nach der Bildung einer größeren Menge von amorphem Eisen(III)-oxidhydroxid entstehen innig verwachsene Kristalle von α- und β-FeOOH. Bei weiterer Alterung geht β- in α-FeOOH über. Bei einer Neutralisation von 95 bis 100% erfolgt eine Umwandlung des amorphen Eisen(III)-oxidhydroxids in α-Fe2O3. Zu 100% neutralisierte Niederschläge verbleiben jedoch teilweise amorph. Die Autoren diskutieren die Faktoren, die die sehr langsame Reaktion bestimmen und zu diesen Ergebnissen führen.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 70 (1937), S. 1947-1952 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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