NDLI: Bidentate iron complexes based on hyperbranched salicylaldimine ligands and their catalytic behavior toward ethylene oligomerization

Content Provider	Springer Nature Link
Author	Li, Cui Qin Wang, Feng Feng Gao, Rui Sun, Peng Zhang, Na Wang, Jun
Copyright Year	2017
Abstract	A series of bidentate iron complexes based on hyperbranched salicylaldimine ligands were synthesized and characterized by spectroscopic and analytical methods. Upon activation with methylaluminoxane (MAO), the complexes showed good activities [up to 8.17 × 10$^{4}$ g/(mol Fe h)] for ethylene oligomerization. Activation of the bidentate iron complex with a 1-octadecyl moiety in the ligand backbone (complex C3) with Et$_{2}$AlCl produced higher catalytic activity than C3 with MAO, although the selectivity for C$_{8+}$ oligomers was lower. The choice of solvent and reaction parameters significantly affected both the activities and selectivities of these complexes. Under the conditions ([Fe] = 5 μmol; temperature = 25 °C; toluene = 50 mL; time = 30 min; ethylene pressure = 0.5 MPa; MAO as cocatalyst), complex C3 gave high activity [7.46 × 10$^{4}$ g/(mol Fe h)] with better selectivity for C$_{8+}$ oligomers (26.58%). The catalytic activities and selectivities were also influenced by the ligand structure and choice of metal. The catalytic activities declined with increasing alkyl chain length of the ligand backbone. Compared to the nickel complex with 1-tetradecyl as core in the ligand backbone (C4), the iron complexes exhibited lower catalytic activities but the better selectivities for C$_{10+}$ oligomers.
Starting Page	339
Ending Page	346
Page Count	8
File Format	PDF
ISSN	03404285
Journal	Transition Metal Chemistry
Volume Number	42
Issue Number	4
e-ISSN	1572901X
Language	English
Publisher	Springer International Publishing
Publisher Date	2017-03-27
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalysis Physical Chemistry Inorganic Chemistry Organometallic Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Inorganic Chemistry

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