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http://ir.ncue.edu.tw/ir/handle/987654321/14775
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| Title: | Hafnium Chloride and Hafnium Methyl Complexes Bearing Substituted Pyrrolyl Ligands: Synthesis, Characterization, and Ethylene Polymerization |
| Authors: | Hsieh, Kun-Chun;Chang, Jr-Chiuan;Lee, Ming-Tsung;Hu, Ching-Han;Hung, Chen-Hsiung;Lee, Hon-Man;Huang, Jui-Hsien;Wang, Mei-Hua;Lee, Ting-Yu |
| Contributors: | 化學系 |
| Keywords: | Hafnium;Pyrrole;Ethylene;Polymerization |
| Date: | 2004-09
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| Issue Date: | 2012-12-10T01:39:36Z
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| Publisher: | Elsevier |
| Abstract: | 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. |
| Relation: | Inorg. Chim. Acta., 357(12): 3517-3524 |
| Appears in Collections: | [化學系] 期刊論文
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