✦ LIBER ✦
Electron spin resonance studies of ziegler-natta-type catalysts. The complex derived from dichlorobis (η-cyclopentadienyl) vanadium (Cp2VCl2) with ethylaluminium sesquichloride to polymerize ethylene
✍ Scribed by A.E. Yildirim
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 323 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
The reaction between CpzVCI2 (Cp = v/-cyclopentadienyl) in CH2C12 and Et3AI2Ct 3 or Et2AICI in n-heptane yields three paramagentic species giving the ESR parameters a~ = 4.11 mT, g = 1.991 (I); a~ = 7.46 mT, g = 1.982 (II); a~ = 7.398 mT, g = 1.985 (II1). Ethylene was polymerized using these catalysts; the solution was examined by the electron spin resonance technique before the polymerization and during the course of the reaction. The catalyst activity decayed quickly, and the mechanism of the reaction is discussed.