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  • 1
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 14 (1993), S. 633-636 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Organolanthanoide compounds; ; yttrium ; holmium ; IR ; NMR spectra ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metallorganische Verbindungen der Lanthanoide. LXVI. Synthese und Röntgenstrukturanalyse von [O(CH2CH2C5H4)2Y(μ-OH)]2 und (MeC5H4)3Ho(H2O), zwei ungewöhnlichen Produkten der Hydrolyse von Organolanthanoide-VerbindungenBei der partiellen Hydrolyse von [O(CH2CH2C5H4)2]Y(C5H4CH3) 1, [O(CH2CH2C5H4)2]Y(C5H5) 3, und [O(CH2CH2C5H4)2]Ho(C5H4CH3) 5 bilden sich [O(CH2CH2C5H4)2)Y(μ-OH)]2 2, (C5H5)3Y(OH2) 9 and (MeC5H4)3Ho(OH2) 11. Die neuen Verbindungen wurden durch Elementaranalysen, sowie IR- und NMR-spektroskopisch charakterisiert. Die Röntgenstrukturanalyse ergibt für 2 eine monokline Elementarzelle, Raumgruppe P21/n mit den Gitterkonstanten a = 1146,0(3), b = 1046,6(3), c = 1514,9(3) pm, β = 94,83(2)°. Die Molekülstruktur zeigt verbrückende Hydroxylgruppen, der mittlere Y—O-Abstand beträgt 223,8(3) pm. 11 kristallisiert kubisch in der Raumgruppe I43d mit a = 1847,9(3) pm mit z = 16 Formeleinheiten in der Elementarzelle. Die Moleküle besitzen C3-3 Symmetrie, die Koordination ist trigonal-pyramidal mit einem Wassermolekül und drei Methylcyclopentadienylliganden. Der Abstand Ho—O beträgt 231 pm.
    Notes: The partial hydrolysis of [O(CH2CH2C5H4)2]Y(C5H4CH3) 1, [O(CH2CH2C5H4)2]Y(C5H5)3, and [O(CH2CH2C5H4)2]Ho(C5H4CH3) 5 results in the formation of [O(CH2CH2CH2C5H4)2Y(μ-OH)2]2 2, (C5H5)3Y(OH2) 9 and (MeC5H4)3Ho(OH2) 11. The new compounds have been characterized by elemental analyses, IR and NMR spectra. The X-ray structural analyses shows 2 to be monoclinic, space group P21/n with a = 1146.0(3), b= 1046.6(3), c = 1514.9(3) pm, β = 94.83(2)°. The molecular structure shows bridging hydroxyl groups with a mean distance Y—O = 223.8(3) pm. 11 crystallizes in the cubic space group 143d with a = 1847.9(3)pm with Z = 16 molecules per unit cell. The molecules posses symmetry C3-3, the coordination is trigonal pyramidal with three methylcyclopentadienyl anions and one water molecule as ligands. The distance Ho—O is 231 pm.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 9 (1995), S. 457-460 
    ISSN: 0268-2605
    Keywords: organic halide ; carbon-halogen bond cleavage ; sodium hydride ; organoyttrium complex ; lanthanide isopropoxides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organic halides can be ubiquitous long-lived contaminants to the environment. Dehalogenation of organic halides with sodium hydride (NaH) as reductant catalyzed by two varieties of lanthanides was reported in respect of environmental remediation. The first catalyst is a dicyclopentadienyl yttrium halide, and organoyttrium hydride was thought to be the reactive species. The second catalyst is a lanthanide isopropoxide which showed higher catalytic reactivity, and an aggregate is involved in the suggested mechanism.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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