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

Research output: Contribution to journalArticle

7 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 languageEnglish
Pages (from-to)3517-3524
Number of pages8
JournalInorganica Chimica Acta
Volume357
Issue number12
DOIs
Publication statusPublished - 2004 Sep 10

Fingerprint

Bearings (structural)
Hafnium
2,3,5-triiodobenzoic acid
hafnium
Toluene
toluene
dimethyl compounds
Ethylene
ethylene
polymerization
chlorides
Ligands
Polymerization
nuclear magnetic resonance
ligands
Monoamine Oxidase
synthesis
Nuclear magnetic resonance spectroscopy
Activation energy
Nuclear magnetic resonance

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

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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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.",
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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 journalArticle

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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