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| 題名: | Hafnium Chloride and Hafnium Methyl Complexes Bearing Substituted Pyrrolyl Ligands: Synthesis, Characterization, and Ethylene Polymerization |
| 作者: | Hsieh, K. C.;Chang, J. C.;Lee, M. T.;Hu, Ching-Han;Hung, J. H.;Lee, H. M.;Huang, J. H.;Wang, M. H.;Lee, T. Y. |
| 貢獻者: | 化學系 |
| 日期: | 2004-09
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| 上傳時間: | 2012-05-03T06:17:47Z
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| 出版者: | Elsevier |
| 摘要: | Reactions of HfCl4 with 2 and 3 equiv. of Li[C4H3N(CH2NMe2)-2] in toluene afford HfCl2[C4H3N(CH2NMe2)-2]2 (1) and HfCl[C4H3N(CH2NMe2)-2]3 (2), respectively. Transmetallation reaction of 1 with 2 equiv. of MeLi results in a hafnium dimethyl compound HfMe2[C4H3N(CH2NMe2)-2]2 (3). A variable-temperature 1H NMR spectroscopic study shows that the activation energy for the dissociation/association of the NMe2 units of compound 2 in solution is ca. 13.6 kcal/mol. Compounds 1–3 are characterized by NMR spectroscopy and single crystal X-ray diffraction. A polymerization study shows that compounds 1 and 3 exhibit moderate activity toward ethylene in the presence of TIBA and MAO.
The reactions of HfCl4 with 2 and 3 equiv. of Li[C4H3N(CH2NMe2)-2] afford HfCl2[C4H3N(CH2NMe2)-2]2 (1) and HfCl[C4H3N(CH2NMe2)-2]3 (2), respectively. Further reaction of 1 with MeLi results in a hafnium dimethyl compound HfMe2[C4H3N(CH2NMe2)-2]2 (3). A polymerization study shows that compounds 1 and 3 exhibit moderate activity toward ethylene in the presence of TIBA and MAO. |
| 關聯: | Inorganica Chimica Acta, 357(12): 3517-3524 |
| 顯示於類別: | [化學系] 期刊論文
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