Struktur,Eigenschaften und NMR-spektroskopische Charakterisierung von Cp2Zr(Pyridin)(Me3SiCCSiMe3)

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 .