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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 131-138 
    ISSN: 0044-2313
    Keywords: Tris[bis(trimethylsilyl)amido]zincate ; Zincate ; Lithium-zincate ; Calcium-bis(zincate) ; Spectroscopic Data ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tris[bis(trimethylsilyl)amido]zincates of Lithium and CalciumCalcium-bis[bis(trimethylsilyl)amide] and Bis[bis(trimethylsilyl)amido]zinc yield in 1,2-dimethoxyethane quantitatively Calcium-bis{tris[bis(trimethylsilyl)- amido]zincate} · 3DME. When THF is chosen as a solvent, the two reactants and the zincate form a temperature-independent equilibrium, whereas in benzene no reaction occurs. The tris[bis(trimethylsilyl)amido]zincate anion displays characteristic 13C{1H) and 29Si{1H] chemical shifts of 7 and -8 ppm, respectively; the nature of the solvent, the cation and the complexating ligands don't influence the IR nor NMR data of the zincate anion and thus verify that [Ca(DME)3]2+ and {Zn[N(SiMe3 2]3}- appear as solvent separated ions, which is also confirmed by their insolubility in hydrocarbons.
    Notes: Calcium-bis[bis(trimethylsilyl)amid] und Bis[bis(trimethylsilyl)amido]zink reagieren in 1,2-Dimethoxyethan quantitativ zum Calcium-bis[tris[bis(trimethylsilyl)amido]zinkat} · 3DME. In THF bilden diese Reaktanden und das aus ihnen gebildete Zinkat ein Temperatur-unabhängiges Gleichgewicht, wohingegen in Benzol keine Reaktion beobachtet wird. Das Tris[bis(trimethylsilyl)amido]zinkat-Anion weist charakteristische chemische Verschiebungen im 13C{1H}- bzw. 29Si{1H}- NMR-Spektrum von 7 und - 8 ppm auf; die Art des Lösungsmittels, das Kation und die Komplexliganden beeinflussen die IR- und NMR-Parameter des Zinkatanions kaum und legen das Vorliegen solvensgetrennter Ionen [Ca(DME)3]2+ und {Zn[N(SiMe3)2]3}- nahe, was auch durch die Unlöslichkeit dieser Zinkate in Kohlenwasserstoffen bestätigt wird.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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