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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 163-173 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Complex Chemistry of Four Center π Systems, IX. 2,2′Bipyridyl- a „Bad Ligand“ for Metals in Low Oxidation StatesThe comparison of the complex series LMo(CO)4, LMo(CO)3PBu3, and LMo(CO)2(PBu3)2 [L = t-C4H9—N=CH—CH=N—t-C4H9 (DAB), 2,2′-bipyridyl (bpy)] and their paramagnetic monoanions reveals that the π-acceptor quality of bpy is only about one half of that of DAB. This follows from EPR spin densities at the coordination sites and 31P coupling constants as well as from the solvatochromism of the absorption in the electronic spectra. π-Interaction (β) is for bpy approximately 0.6 eV, while it reaches 1 eV for DAB.
    Notes: Der Vergleich der Komplexreihen LMo(CO)4, LMo(CO)3PBu3 und LMo(CO)2(PBu3)2 [L = t-C4H9—N=CH—CH=N—t-C4H9 (DAB); 2,2′-Bipyridyl (bpy)] und ihrer paramagnetischen Monoanionen zeigt, daß die π-Akzeptorfähigkeit von bpy nur etwa halb so groß ist wie die von DAB. Das ergibt sich aus den Spindichten an den Koordinationszentren und den 31P-Kopplungen im ESR sowie aus der Solvatochromie der Absorptionen in den Elektronenspektren. Die π-Wechselwirkung (β) erreicht für bpy nur ca. 0.6 eV, für DAB 1 eV.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 136-145 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Radical Anions, I. Synthesis of Acyclic and Cyclic Silylated 1,2-EthenediaminesReactions of radical anions obtained by the reduction of glyoxal diimines RN=CH—CH=NR 3 (3a: R = tert-butyl; 3b: R = 2,6-xylyl) with chlorotrimethylsilane, dichlorodimethylsilane, and dichloromethylsilane afford acyclic N-mono and N,N′-disilylated ene-diamines 6, 8, 9, and cyclic diazasilacyclopentenes 10, 11, 13, respectively. C-Silylation is a minor side-reaction. 13C NMR, IR, and PE data are consistent with a non-planar E-configuration for 8 and Z-configuration for 6. In agreement with MS data and the very low 1. ionisation potentials, the planar heterocycles 10 and 13 on oxidation yield stable, delocalized radical cations, which are characterized ESR-spectroscopically.
    Notes: Durch Reduktion der Glyoxaldiimine RN=CH—CH=NR 3 (3a: R = tert-Butyl; 3b: R = 2,6-Xylyl) erhältliche Radikalanionen reagieren mit Chlortrimethylsilan, Dichlordimethylsilan und Dichlormethylsilan zu offenkettigen N-mono- bzw. N,N′-disilylierten En-diaminen 6, 8, 9 bzw. zu cyclischen Diazasilacyclopentenen 10, 11, 13. C-Silylierung wird nur als Nebenreaktion beobachtet. 13C-NMR-, IR- und PE-Daten belegen eine nicht-planare E-Konfiguration für 8 und Z-Konfiguration für 6. Die planaren Heterocyclen 10 und 13 bilden in Übereinstimmung mit den MS-Daten und der geringen 1. Ionisierungsenergie stabile, delokalisierte Radikalkationen, die ESR-spektroskopisch charakterisiert werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 244-245 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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