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Synthesis and characterization of sterically expanded ansa-η1-fluorenyl-amido complexes
Synthesis and characterization of sterically expanded ansa-η1-fluorenyl-amido complexes
- Source :
-
Polyhedron . Aug2005, Vol. 24 Issue 11, p1314-1324. 11p. - Publication Year :
- 2005
-
Abstract
- Abstract: The octamethyloctahydrodibenzofluorenyl (Oct) ligand has been incorporated into twelve ansa-Oct-amido complexes having the general structures Me2Si(η1-C29H36)(η1-N- t Bu)MX2 ·L or Me2Si(η5-C29H36)(η1-N- t Bu)MX2 (M=Zr or Hf): 2 (X=Cl, L=Et2O); 3 (X=Br, L=Et2O); 4 (X=Me, L=Et2O); 5 (X=Me, L=THF); 6 (X=CH2Ph); and 7 (X=CH2SiMe3). The solid-state structures have been determined for seven of these complexes by X-ray crystallography, revealing η5-C29H36 coordination for the ether-free, pseudotetrahedral species 6-Zr, 6-Hf, and 7-Zr, but η1-C29H36 coordination for the ether-bound, trigonal bipyramidal species 2-Zr, 3-Zr, 3-Hf, and 5-Zr. The unusual η1-C29H36 coordination was assigned because only one metal–carbon bond in each structure was in the range of 2.281–2.330Å; a second metal–carbon distance was found between 2.731 and 2.847Å; the remaining metal–carbon distances were found between 3.130 and 4.029Å. An increase in the hapticity of these and other Oct- and fluorenyl-containing compounds was correlated to a convergence in the carbon–carbon bond lengths within the relevant five-membered rings. [Copyright &y& Elsevier]
- Subjects :
- *FLUORENE
*METHANE
*CYCLOHEPTAFLUORENE
*CHEMICAL reactions
Subjects
Details
- Language :
- English
- ISSN :
- 02775387
- Volume :
- 24
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Polyhedron
- Publication Type :
- Academic Journal
- Accession number :
- 18179839
- Full Text :
- https://doi.org/10.1016/j.poly.2005.03.011