Trimethylsilylcyclopentadienylchromium(III) complexes with diphenyl-2-pyridylphosphine
No Thumbnail Available
Date
2004
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Reaction of CrCl with LiCpSiMe3 in THF leads to the formation of a solvated intermediate, [(n(5)-Me3SiCp)CrCl2(THF)], which in turn reacts with diphenyl-2-pyridylphosphine to yield the complex [(C6H5)(2)PC5H4NH][(eta(5) -Me3SiCp)CrCl3] (1) in 66% yield. As a secondary product was isolated the neutral complex [(eta(5)-Me3SiCp)CrCl2{(C6H5)(2)PC5H4N}] (2) in 5% yield. The structure of complex 1 has been determined by single crystal X-ray diffraction. In the anion the metal centre shows a pseudo-octahedral geometry with the centroid of the trimethylsilylcyclopentadienyl ligand occupying the centre of three octahedral sites, and three chloride atoms completing the co-ordination sphere. Complex 1 in the presence of MAO leads to the formation of an active catalyst for the polymerization of ethylene. (C) 2004 Elsevier B.V. All rights reserved.
Description
Keywords
chromium complexes, cyclopentadienyl complexes, diphenyl-2-pyidylphosphine complexes, crystal structure, ethylene polymerization