Stereospecific polymerization of propylene with group 4 ansa-fluorenylamidodimethyl complexes
この文献の参照には次のURLをご利用ください : http://ir.lib.hiroshima-u.ac.jp/00014676
ID | 14676 |
本文ファイル | |
著者 |
Nishii, Kei
Hagihara, Hideaki
Ikeda, Tomiki
Akita, Munetaka
|
キーワード | Atactic
Metallocene catalysts
Polypropylene
Syndiotactic
|
NDC |
化学
|
内容記述 | Group 4 [η1:η3-tert- butyl(dimethylfluorenylsilyl)amido]dimethyl complexes [t-BuNSiMe 2Flu]MMe2 (M = Ti, 1; Zr, 2; Hf, 3) were synthesized in a one-pot synthesis starting from the ligand, MeLi and MCl4 (M = Ti, Zr, Hf), respectively. The structures of these complexes were determined by X-ray crystallography and the results obtained revealed that the fluorenyl ligand coordinates to center metal in a η3-manner irrespective of center metal employed. Propylene polymerization was conducted at 0 or 20 °C in toluene by 1-3 combined with dried methylaluminoxane (MAO), which was prepared from the toluene solutions of MAO by removing free trialkylaluminiums, and HNMe2PhB(C6F5)4 in the presence of triisobutylaluminium. The 1-dried MAO system gave the polymer with syndiotactic triad (rr) of 63 0x1.e2fc8p-891t 0 °C, whereas 2 and 3 did not give any polymer in the same conditions. The 2-dried MAO system gave the polymer with the highest syndiotacticity (rr = 97%) at 20 °C, although the activity was low. The 3-dried MAO system did not give any polymer even at 20 °C. When HNMe2PhB(C6F5)4 was used in place of dried MAO at 20 °C, 1 gave almost atactic polymer, while 2 and 3 gave highly syndiotactic one (rr > 90%). These results indicate that the catalytic performance strongly depended on the center metal of the ansa- fluorenylamidodimethyl complexes as well as cocatalysts employed.
|
掲載誌名 |
Journal of Organometallic Chemistry
|
巻 | 691巻
|
号 | 1-2号
|
開始ページ | 193
|
終了ページ | 201
|
出版年月日 | 2006-01
|
出版者 | Elsevier
|
ISSN | 0022-328X
|
出版者DOI | |
言語 |
英語
|
NII資源タイプ |
学術雑誌論文
|
広大資料タイプ |
学術雑誌論文
|
DCMIタイプ | text
|
フォーマット | application/pdf
|
著者版フラグ | author
|
権利情報 | Copyright (c) 2005 Elsevier B.V
|
関連情報URL(IsVersionOf) | http://dx.doi.org/10.1016/j.jorganchem.2005.08.027
|
部局名 |
工学研究科
|