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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and Characterisation of Ionic Ozonides with Bisquaternary Ammonium CounterionsDedicated to Professor Max Herberhold on the occasion of his 60th birthday. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 997-1001 
    Details
    ISSN: 0009-2940
    Keywords: Ionic ozonides ; Ammonium ion, bisquaternary ; C-H…O hydrogen bonds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bisquaternary ammonium ozonides Me3N+(CH2)n +NMe3(O3-)2 with n = 3, 4, 6 (1, 2, 3), Me3N+(CH2)3+NMe3(O3-)2 · 3 NH3 (1a), Me3N+(p-Ph)+NMe3(O3-)2 (4) and Me3N+(p-Ph)+NMe3(O3-)2 · NH3 (4a) were obtained in quantitative yields by cation exchange starting from CsO3. The compounds 1a and 3 have been studied by single crystal X-ray analysis. The influence of C-H…O and N-H…O hydrogen bonds on the bond length and the bond angle of the ozonide anion is discussed; earlier results are included. The difference between the two bond lengths within the O3- ion [137.4(3) pm and 129.5(3) pm] in 1a is unexpectedly large. Thermal stabilities determined by DTA/TG methods range from 24-83°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290904
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  • 2
    Electronic Resource
    Electronic Resource
    A Novel Approach to the Synthesis of Endohedral Fullerenes as Demonstrated by Endohedral Barium Fullerenes (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1761-1764 
    Details
    ISSN: 0009-2940
    Keywords: Endohedral ; Barium ; Fullerenes ; Dibarium fullerenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new route to endohedral fullerenes involving the evaporation of carbon and a metal at different positions, i.e. at different temperatures, in a radio-frequency furnace is described. For the first time, endohedral barium fullerenes within the composition range Ba@C74 to Ba@C136 have been produced in high yields as compared to hollow fullerenes, and have been extracted with CS2. Ba@C60, and Ba@C70, are only soluble in CS2 following sublimation. Furthermore, the first nonlanthanoid dimetallo fullerenes ranging in composition from Ba2@C88 to Ba2@C116 have been obtained. All endohedral barium fullerenes were characterized by mass spectrometry. Properties such as sublimation behaviour, solubility, and sensitivity to air have been studied.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971301209
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der ionischen Ozonide P(CH3)4O3 und As(CH3)4O3 (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 431-434 
    Details
    ISSN: 0044-2313
    Keywords: Ionic ozonides ; preparation ; P(CH3)4O3 ; As(CH3)4O3 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Knowledge of the New Ionic Ozonides P(CH3)4O3 and As(CH3)4O3P(CH3)4O3 and As(CH3)4O3 were prepared via ion exchange in liquid ammonia and characterized by X-ray-powder, IR, MS and DTA techniques. P(CH3)4O3 and As(CH3)4O3 are isotypic and have a wurtzite-like arrangement of ions with rotationally disordered O3-. (Powder data: P63mc; P(CH3)4O3: a = 687.8(2), c = 964.6(3) pm; As(CH3)4O3: a = 708.6(1), c = 991.0(3) pm). As(CH3)4O3 shows a displacive phase transition at -135°C. The low temperature phase is orthorhombic (a = 715.8(7), b = 1 209(1), c = 943.3(1) pm).
    Notes: P(CH3)4O3 und As(CH3)4O3 wurden mittels Ionenaustausch in fl. NH3 erstmals dargestellt und mit Röntgenpulvermethoden, IR-Spektroskopie, MS und DTA charakterisiert. P(CH3)4O3 und As(CH3)4O3 sind isotyp und bilden eine Ionenpackung im Wurtzit-Typ mit fehlgeordnetem O3-. (Röntgenpulverdaten: P63mc; P(CH3)4O3: a = 687,8(2), c = 964,6(3) pm; As(CH3)4O3: a = 708,6(1), c = 991,0(3) pm). As(CH3)4O3 zeigt bei - 135°C eine displazive Phasenumwandlung. Die Tieftemperaturphase hat orthorhombische Metrik (a = 715,8(7), b = 1 209(1), c = 943,3(1) pm).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210316
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Bildung von Fullerenen und endohedralen Metallofullerenen: Darstellung im Hochfrequenzofen (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 689-693 
    Details
    ISSN: 0044-2313
    Keywords: Fullerenes ; endohedral metallofullerenes ; preparation ; thermodynamics of formation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Fullerenes and Endohedral Metallofullerenes: Preparation in a Radiofrequency FurnaceA thermodynamic analysis of the reaction of formation is presented for C60. The alternative route for the preparation of fullerenes by evaporating carbon in a RF-furnace is described. This process is characterized by its broad variability and by comparatively mild conditions which, in addition, may be measured and controlled rather precisely. Thus, it offers favorite facilities for the production of soots with high contents of fullerenes and endohedral fullerenes. So far, LaC82 could be extracted using toluene.
    Notes: Eine thermodynamische Analyse der Bildungsreaktion von C60 wird gegeben und die Darstellung von Fullerenen im Hochfrequenzofen beschrieben. Dieses neue Verfahren zeichnet sich durch eine hohe Variabilität und vergleichsweise schonende Bedingungen aus, die gut meß- und kontrollierbar sind. Es bietet daher günstige Voraussetzungen zur Herstellung von Rußen mit gesteigerten Anteilen höherer Fullerene und, im Falle von Coverdampfungen, endohedraler Metallofullerene. Bisher konnte in Toluolextrakten LaC82 nachgewiesen werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210432
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