期刊
DALTON TRANSACTIONS
卷 47, 期 39, 页码 -出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt02130a
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资金
- National Natural Science Foundation of China [21404018]
- State Key Laboratory of Fine Chemicals [KF1711]
- Fundamental Research Funds for the Central Universities [DUT18LK14]
- Education Department of the Liaoning Province [LT2015007]
Bis(oxazoline)-derived N-heterocyclic carbene (IBiox) supported rare-earth (Sc, Y, Lu) trialkyl complexes have been synthesized and structurally characterized, and their catalytic activity in the (co)polymerization of -olefins has been studied. The treatment of Ln(CH2SiMe3)(3)(THF)(2) with one equivalent of freshly prepared IBiox afforded the rare-earth metal complexes (IBiox)Ln(CH2SiMe3)(3)THFn (Ln = Sc (1), n = 0; Y (2), n = 1; and Lu (3), n = 1) in good yields. Single crystal X-ray diffraction study showed that 1 is pseudo tetrahedral, while 2 and 3 are distorted trigonal bipyramidal with coordinated THF. The Ln-C(carbene) bond distances in 1, 2, and 3 are 2.352, 2.550, and 2.479 angstrom, respectively. DFT calculations were performed to study the bonding scheme and the structural stability. Complex 1 showed a high activity for 1-hexene polymerization by activation with 2 equivalents of [Ph3C][B(C6F5)(4)], and the resultant polymers are predominantly vinylene end groups (ca. 95%). Moreover, the catalyst system based on 1 proved to be effective for the copolymerization of 1-hexene with 1,7-octadiene, affording the copolymers with about 20% pendant vinyl groups. The hydrophilicity of the copolymers was improved by modifying the vinyl groups with carboxyls via a thiol-ene reaction.
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