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 | |
| 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
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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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UR - http://www.scopus.com/inward/citedby.url?scp=4444238807&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2004.05.005
DO - 10.1016/j.ica.2004.05.005
M3 - Article
AN - SCOPUS:4444238807
VL - 357
SP - 3517
EP - 3524
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
IS - 12
ER -