Science News

Bis(oxazoline)-derived N-heterocyclic carbene ligated rare-earth metal complexes: synthesis, structure, and polymerization performance.

A new interesting article has been published in Dalton Trans. 2018 Oct 9;47(39):13815-13823. doi: 10.1039/c8dt02130a. and titled:

Bis(oxazoline)-derived N-heterocyclic carbene ligated rare-earth metal complexes: synthesis, structure, and polymerization performance.

Authors of this article are:
Pan Y 1, Zhao A , Li Y , Li W , So YM , Yan X , He G .

A summary of the article is shown below:
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 α-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)3THFn (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 Å, 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.

Check out the article’s website on Pubmed for more information:



This article is a good source of information and a good way to become familiar with topics such as: n/a.

Categories: Science News