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Title: Hafnium Chloride and Hafnium Methyl Complexes Bearing Substituted Pyrrolyl Ligands: Synthesis, Characterization, and Ethylene Polymerization
Authors: 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.
Contributors: 化學系
Date: 2004-09
Issue Date: 2012-05-03T06:17:47Z
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: Inorganica Chimica Acta, 357(12): 3517-3524
Appears in Collections:[Department of Chemistry] Periodical Articles

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