TY - JOUR
T1 - Synthesis, characterization and ethylene reactivity of 2-ester-6- iminopyridyl metal complexes
AU - Zhang, Wenjuan
AU - Wu, Biao
AU - Sun, Wen Hua
PY - 2006
Y1 - 2006
N2 - A series of late-transition metal complexes such as iron (L)FeCl 2 (3a-f), cobalt (L)CoCl2 (4a-f), nickel (5a-f) and palladium(6a-f) complexes have been prepared by the reaction of 2-carboxylate-6-iminopyridine 2a-f [2-COOEt-6-(2,6-R2C 6H3N=CCH3)C5H3N (2a: R = CH3, 2b: R = Et, 2c: R = i-Pr, 2d: R = F, 2e: R = Cl, 2f: R = Br)] with MCl2 (M = Fe, Co, Ni or Pd). These complexes were characterized by elemental analysis, IR spectroscopy and X-ray crystallography. These complexes were tested for ethylene oligomerization and polymerization in the presence of MAO under various reaction conditions. The iron complexes exhibited high catalytic activities for ethylene polymerization/ oligomerization, whereas the cobalt complexes showed moderate activities for the polymerization and high activities for the oligomerization. In addition, the iron catalysts predominantly produced linear oligomers and polyethylene with vinyl group. Nickel complexes showed remarkably high catalytic activities for the ethylene oligomerization affording C4-C8 olefins as the main products, although the selectivity of α-olefin was very low. Palladium complexes showed moderate activity for the ethylene oligomerization and polymerization, and the oligomer product was only C4. These facts indicated that the nature of the metal core strongly affects toward the catalyst behavior in these catalyses.
AB - A series of late-transition metal complexes such as iron (L)FeCl 2 (3a-f), cobalt (L)CoCl2 (4a-f), nickel (5a-f) and palladium(6a-f) complexes have been prepared by the reaction of 2-carboxylate-6-iminopyridine 2a-f [2-COOEt-6-(2,6-R2C 6H3N=CCH3)C5H3N (2a: R = CH3, 2b: R = Et, 2c: R = i-Pr, 2d: R = F, 2e: R = Cl, 2f: R = Br)] with MCl2 (M = Fe, Co, Ni or Pd). These complexes were characterized by elemental analysis, IR spectroscopy and X-ray crystallography. These complexes were tested for ethylene oligomerization and polymerization in the presence of MAO under various reaction conditions. The iron complexes exhibited high catalytic activities for ethylene polymerization/ oligomerization, whereas the cobalt complexes showed moderate activities for the polymerization and high activities for the oligomerization. In addition, the iron catalysts predominantly produced linear oligomers and polyethylene with vinyl group. Nickel complexes showed remarkably high catalytic activities for the ethylene oligomerization affording C4-C8 olefins as the main products, although the selectivity of α-olefin was very low. Palladium complexes showed moderate activity for the ethylene oligomerization and polymerization, and the oligomer product was only C4. These facts indicated that the nature of the metal core strongly affects toward the catalyst behavior in these catalyses.
UR - http://www.scopus.com/inward/record.url?scp=33845601320&partnerID=8YFLogxK
U2 - 10.1016/s0167-2991(06)80445-3
DO - 10.1016/s0167-2991(06)80445-3
M3 - Article
AN - SCOPUS:33845601320
SN - 0167-2991
VL - 161
SP - 141
EP - 146
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
ER -