Abstract
The synthesis and the properties of the complexes Cp 2TaCl 2, Cp 2M(allyl), Cp 2M(1-methylallyl) and Cp 2M(2-methylallyl) with M Nb, Ta are described. The complex Cp 2TaCl 2 has one unpaired electron per tantalum atom, while the allyl complexes are diamagnetic. The IR and PMR spectra indicate that the allyl group is π-bonded to the metal. The mass spectra of the complexes are discussed; the thermal stability of the Cp 2Nb- and Cp 2Ta-(allyl) complexes was investigated by differential thermal analysis. The properties of the niobium and tantalum complexes are compared with those of the corresponding titanium complexes.
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