| Autor: |
Herrmann, W. A., Munck, F. C., Artus, G. R. J., Runte, O., Anwander, R. |
| Zdroj: |
Organometallics; February 18, 1997, Vol. 16 Issue: 4 p682-688, 7p |
| Abstrakt: |
The synthesis and X-ray crystal structures of Y[N(SiHMe2)2]3(carbene)x (carbene = 1,3-dimethylimidazolin-2-ylidene, x = 1, 2) are described. The donor capability of the strongly nucleophilic carbene ligand is expressed in both the displacement of two THF ligands by one carbene ligand in precursor compound Y[N(SiHMe2)2]3(THF)2 and by the addition of a second carbene ligand to yield the preferred (3 + 2) trigonal bipyramidal coordination geometry. In particular, the structural data reveal that the carbene ligands affect the coordination mode of the bis(dimethylsilyl)amide counterligands by forcing them to form close β-Si−H(silylamide)−yttrium agostic contacts. According to Pearson's terminology such carbene ligands have to be classified as hard donor ligands. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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