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  • Chemistry  (1)
  • 1
    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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