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  • 1990-1994  (3)
  • 1980-1984
  • 1990  (3)
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  • 1990-1994  (3)
  • 1980-1984
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 39-41 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Keywords: 81.15Gh ; 52.90+z ; 68.55+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Novel volatile cyclooctatetraenyl-pentamethylcyclopentadienyl sandwich complexes have been used as precursors to deposit thin yttrium and rare earth oxide films by means of PECVD. These compounds form pure oxide films in plasmas of argon/oxygen or argon/water-vapour, in nitrous oxide, and carbon dioxide at substrate temperatures of 350–400° C and power densities of 1.0–1.5 W/cm2. The films were characterized by metal analysis, carbon analysis, XPS, CTEM electron diffraction, SEM micrographs, and FTIR spectra.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometallic Compounds of the Lanthanides. LIII. (C5H5Gd)5(μ2-OCH3)4(μ3-OCH3)4 (μ5-O) and [Na2(tC4H9OGd)4(μ3-OtC4H9)8(μ6-O)], two New Alkoxi Gadolinium Clusters with Interstitial OxygenGadolinium trichloride reacts in tetrahydrofurane with cyclopentadienyl sodium and two equivalents of sodium methoxide with formation of (C5H5Gd)5(μ2-OCH3)4(μ3-OCH3)4(μ5-O) (1), and with potassium tert-butoxide with formation of [Na2(tC4H9OGd)4(μ3-OtC4H9)8(μ6-O)] (2). The X-ray structure of 1 shows a tetragonal pyramide build up by five gadolinium atoms, containing an oxygen atom in the center of the base and eight bridging methoxo groups. The structure of 2 consists of an oxygen centered octahedron build up by two sodium and four gadolinium atoms, connected by eight bridging tert-butoxy groups and four terminal butoxides. The monoclinic crystals of 1, space group I2/a have the following crystallographic data: a = 2 276.9(5) pm, b = 2 063.1(6) pm, c = 3 152.2(3) pm, β = 90.7(1)°, Z = 12, Dcalcd 1.85 g · cm-3, R = 0.0519. 2 crystallizes tetragonal, space group I4/mmm with a = 1 728.5(4) pm, b = 1 031.0(3) pm, Z = 2, Dcalcd 1.69 g · cm-3, R = 0.0682.
    Notes: Gadoliniumtrichlorid bildet in Tetrahydrofuran mit Cyclopentadienylnatrium und zwei Äquivalenten Natriummethanolat (C5H5Gd)5(μ2-OCH3)4(μ3-OCH3)4(μ5-O) (1), mit Kalium-tert-butanolat kann dagegen [Na2(tC4H9OGd)4(μ3-OtC4H9)8(μ6-O)] (2) isoliert werden. Die Röntgenstrukturanalyse von 1 zeigt eine tetragonale Pyramide aus 5 Gadoliniumatomen mit einem Sauerstoffatom im Zentrum der Basisfläche sowie acht verbrückenden Methanolatgruppen, die von 2 einen aus zwei Natrium- und vier Gadoliniumatomen gebildeten, Sauerstoff-zentrierten Oktaeder mit vier endständigen und acht verbrückenden tert-Butanolat-Einheiten. Die monoklinen Kristalle von 1, Raumgruppe I2/a haben folgende Gitterkonstanten: a = 2 276,9(5) pm, b = 2 063,1(6) pm, c = 3 152,2(3) pm, β = 90,7(1)°, Z = 12, Dber. 1,85 g/cm3, R = 0,0519. 2 kristallisiert tetragonal, Raumgruppe I4/mmm mit a = 1 728,5(4) pm, c = 1 031,0(3) pm, Z = 2, Dber. 1,69 g/cm3, R = 0,0682.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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