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  • 1
    ISSN: 0044-2313
    Keywords: Alkyne Complexes ; Zirconocene ; structure ; NMR-dynamics ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure, Properties, and NMR Spectroscopical Characterization of Cp2Zr(pyridine)(Me3SiC≡CSiMe3)Displacement of the THF ligand in Cp2Zr(THF)(Me3SiC≡CSiMe3) (1) with pyridine yields Cp2Zr(η1-NC5H5)(Me3SiC≡CSiMe3) (3). Unlike 1, the complex 3 is stable in hydrocarbon solvents. According to the temperature dependent 1H and 13C NMR spectra, the structure of complex 3 in solution is dynamic due to a rotation of the alkyne ligand. In addition, when 3 is dissolved in pyridine an easy exchange between coordinated and free molecules of pyridine takes place. In the solid state complex 3 displays a tetrahedral coordination sphere at the zirconium center composed of Cp ligands, alkyne and pyridine as shown by an X-ray structure analysis. The complex 3 reacts readily with water and carbon dioxide giving the same products as in the case of 1.
    Notes: Die Substitution des THF-Liganden in Cp2Zr(THF)(Me3SiC≡CSiMe3) (1) durch Pyridin ergibt den Komplex Cp2Zr(η1-NC5H5)(Me3SiC≡CSiMe3) (3). Im Gegensatz zu 1 ist Komplex 3 stabil in Kohlenwasserstoffen.In temperaturabhängigen 1H- und 13C-NMR-Spektren zeigt 3 in Lösung dynamisches Verhalten durch eine Rotation des Alkin-Liganden. Zusätzlich tritt beim Lösen von 3 in Pyridin ein Austausch zwischen koordinierten und freien Pyridin-Molekülen auf. Die Kristallstrukturanalyse von 3 belegt eine tetraedrische Koordinationsgeometrie am Zirkonium-Zentrum bestehend aus den Cp-, Alkin- und Pyridin-Liganden. Der Komplex 3 reagiert wie Verbindung 1 mit Wasser und Kohlendioxid zu gleichen Produkten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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