Back to Search
Start Over
2-Benzoxazolyl-6-(1-(arylimino)ethyl)pyridyl cobalt (II) chlorides: A temperature switch catalyst in oligomerization and polymerization of ethylene
- Source :
-
Journal of Molecular Catalysis A: Chemistry . Aug2009, Vol. 309 Issue 1/2, p166-171. 6p. - Publication Year :
- 2009
-
Abstract
- Abstract: A series of cobalt (II) complexes ligated by 2-(2-benzoxazolyl)-6-(1-(arylimino)ethyl)pyridines was synthesized and characterized by FT-IR spectroscopic and elemental analysis. The molecular structures of Co1 (Ar=2,6-Me2C6H3), Co2 (Ar=2,6-Et2C6H3) and Co7 (Ar=2,6-Br2C6H3) were determined by single-crystal X-ray diffraction. Compounds Co1 and Co2 display a distorted trigonal-bipyramidal geometry, whereas complex Co7 is a distorted square-pyramid. Upon activation with methylaluminoxane (MAO), all cobalt complexes showed reactivity towards ethylene. There was however an unexpected temperature dependence; whereas, at room temperature oligomerization was observed, giving 1-alkenes with high selectivities, at elevated temperatures polyethylene was produced. This unusual catalytic behavior of the new complexes was investigated in detail under various reaction parameters. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 13811169
- Volume :
- 309
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular Catalysis A: Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 43311476
- Full Text :
- https://doi.org/10.1016/j.molcata.2009.05.021