Back to Search Start Over

Synthesis and characterization of sterically expanded ansa-η1-fluorenyl-amido complexes

Synthesis and characterization of sterically expanded ansa-η1-fluorenyl-amido complexes

Authors :
Irwin, Levi J.
Reibenspies, Joseph H.
Miller, Stephen A.
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]

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