TY - JOUR
T1 - Synthesis, molecular structure and catalytic activity of chiral benzamidinate nickel complexes
AU - Nelkenbaum, Elza
AU - Kapon, Moshe
AU - Eisen, Moris S.
N1 - Funding Information:
This research was supported by the German Israel Foundation under Contract I-621-27.5/1999 and by the Fund for the Promotion of Research at the Technion.
PY - 2005/7/1
Y1 - 2005/7/1
N2 - Two new nickel complexes containing the chiral benzamidinate ligation: [PhC(N-SiMe3)(N′-myrtanyl)]2Ni(py)2 (3) and {[PhC(NH)(N′-myrtanyl)]2Ni}2 (6) have been synthesized and characterized. The solid-state molecular structures of these complexes have been determined by low-temperature X-ray diffraction analysis. Complex 3 was obtained via two different procedures. In complex 3, the metal adopts a nearly ideal octahedral environment, whereas in complex 6 the two divalent nickel metals are coordinated in a square-planar geometry, forming a dimer. Complex 3 activated with MAO has been found to oligomerize propylene producing a mixture of dimers, trimers and tetramers with a turnover frequency of 5200 h-1, whereas complex 6 being activated with MAO oligomerizes ethylene to a mixture of dimers and trimers with a high turnover frequency of 15,400 h-1. In addition, when activated with MAO both complexes showed a good activity for the vinyl-type polymerization of norbornene.
AB - Two new nickel complexes containing the chiral benzamidinate ligation: [PhC(N-SiMe3)(N′-myrtanyl)]2Ni(py)2 (3) and {[PhC(NH)(N′-myrtanyl)]2Ni}2 (6) have been synthesized and characterized. The solid-state molecular structures of these complexes have been determined by low-temperature X-ray diffraction analysis. Complex 3 was obtained via two different procedures. In complex 3, the metal adopts a nearly ideal octahedral environment, whereas in complex 6 the two divalent nickel metals are coordinated in a square-planar geometry, forming a dimer. Complex 3 activated with MAO has been found to oligomerize propylene producing a mixture of dimers, trimers and tetramers with a turnover frequency of 5200 h-1, whereas complex 6 being activated with MAO oligomerizes ethylene to a mixture of dimers and trimers with a high turnover frequency of 15,400 h-1. In addition, when activated with MAO both complexes showed a good activity for the vinyl-type polymerization of norbornene.
KW - Chiral benzamidinates
KW - Chiral nickel complexes
KW - Ethylene oligomerization
KW - Nickel
KW - Polymerization
KW - Propylene oligomerization
KW - X-ray structure
UR - http://www.scopus.com/inward/record.url?scp=20144361843&partnerID=8YFLogxK
U2 - 10.1016/j.jorganchem.2005.04.007
DO - 10.1016/j.jorganchem.2005.04.007
M3 - 文章
AN - SCOPUS:20144361843
SN - 0022-328X
VL - 690
SP - 3154
EP - 3164
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
IS - 13
ER -