Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands: Synthesis, characterization, and ethylene polymerization

Kun Chun Hsieh; Jr Chiuan Chang; Ming Tsung Lee; Ching Han Hu; Chen Hsiung Hung; Hon Man Lee; Jui Hsien Huang; Mei Hua Wang; Ting Yu Lee

doi:10.1016/j.ica.2004.05.005

Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands: Synthesis, characterization, and ethylene polymerization

Kun Chun Hsieh, Jr Chiuan Chang, Ming Tsung Lee, Ching Han Hu, Chen Hsiung Hung, Hon Man Lee, Jui Hsien Huang, Mei Hua Wang, Ting Yu Lee

Department of Chemistry

Research output: Contribution to journal › Article

8 Citations (Scopus)

Abstract

Reactions of HfCl₄ with 2 and 3 equiv. of Li[C₄H ₃N(CH₂NMe₂)-2] in toluene afford HfCl ₂[C₄H₃N(CH₂NMe₂)-2] ₂ (1) and HfCl[C₄H₃N(CH₂NMe ₂)-2]₃ (2), respectively. Transmetallation reaction of 1 with 2 equiv. of MeLi results in a hafnium dimethyl compound HfMe ₂[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.

Original language	English
Pages (from-to)	3517-3524
Number of pages	8
Journal	Inorganica Chimica Acta
Volume	357
Issue number	12
DOIs	https://doi.org/10.1016/j.ica.2004.05.005
Publication status	Published - 2004 Sep 10

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All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Cite this

Hsieh, K. C., Chang, J. C., Lee, M. T., Hu, C. H., Hung, C. H., Lee, H. M., Huang, J. H., Wang, M. H., & Lee, T. Y. (2004). Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands: Synthesis, characterization, and ethylene polymerization. Inorganica Chimica Acta, 357(12), 3517-3524. https://doi.org/10.1016/j.ica.2004.05.005

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. / Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands : Synthesis, characterization, and ethylene polymerization. In: Inorganica Chimica Acta. 2004 ; Vol. 357, No. 12. pp. 3517-3524.

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title = "Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands: Synthesis, characterization, and ethylene polymerization",

abstract = "Reactions of HfCl4 with 2 and 3 equiv. of Li[C4H 3N(CH2NMe2)-2] in toluene afford HfCl 2[C4H3N(CH2NMe2)-2] 2 (1) and HfCl[C4H3N(CH2NMe 2)-2]3 (2), respectively. Transmetallation reaction of 1 with 2 equiv. of MeLi results in a hafnium dimethyl compound HfMe 2[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.",

author = "Hsieh, {Kun Chun} and Chang, {Jr Chiuan} and Lee, {Ming Tsung} and Hu, {Ching Han} and Hung, {Chen Hsiung} and Lee, {Hon Man} and Huang, {Jui Hsien} and Wang, {Mei Hua} and Lee, {Ting Yu}",

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Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands : Synthesis, characterization, and ethylene polymerization. / 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.

In: Inorganica Chimica Acta, Vol. 357, No. 12, 10.09.2004, p. 3517-3524.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Hafnium chloride and hafnium methyl complexes bearing substituted pyrrolyl ligands

T2 - Synthesis, characterization, and ethylene polymerization

AU - Hsieh, Kun Chun

AU - Chang, Jr Chiuan

AU - Lee, Ming Tsung

AU - Hu, Ching Han

AU - Hung, Chen Hsiung

AU - Lee, Hon Man

AU - Huang, Jui Hsien

AU - Wang, Mei Hua

AU - Lee, Ting Yu

PY - 2004/9/10

Y1 - 2004/9/10

N2 - Reactions of HfCl4 with 2 and 3 equiv. of Li[C4H 3N(CH2NMe2)-2] in toluene afford HfCl 2[C4H3N(CH2NMe2)-2] 2 (1) and HfCl[C4H3N(CH2NMe 2)-2]3 (2), respectively. Transmetallation reaction of 1 with 2 equiv. of MeLi results in a hafnium dimethyl compound HfMe 2[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.

AB - Reactions of HfCl4 with 2 and 3 equiv. of Li[C4H 3N(CH2NMe2)-2] in toluene afford HfCl 2[C4H3N(CH2NMe2)-2] 2 (1) and HfCl[C4H3N(CH2NMe 2)-2]3 (2), respectively. Transmetallation reaction of 1 with 2 equiv. of MeLi results in a hafnium dimethyl compound HfMe 2[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.

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10.1016/j.ica.2004.05.005