NDLI: Bimetallic amine-bridged bis(phenolate) lanthanide aryloxides and alkoxides: synthesis, characterization, and application in the ring-opening polymerization of rac-lactide and rac-β-butyrolactone

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Bimetallic amine-bridged bis(phenolate) lanthanide aryloxides and alkoxides: synthesis, characterization, and application in the ring-opening polymerization of rac-lactide and rac-β-butyrolactone

Content Provider	Springer Nature Link
Author	Nie, Kun Feng, Tao Song, FengKui Zhang, Yong Sun, HongMei Yuan, Dan Yao, YingMing Shen, Qi
Copyright Year	2014
Abstract	A series of neutral bimetallic lanthanide aryloxides p-C$_{6}$H$_{4}$[OLnL(THF)$_{ n }$]$_{2}$ [Ln = Y (1), Yb (2), Sm (3) (n = 1) and La (4) (n = 2), L = Me$_{2}$NCH$_{2}$CH$_{2}$N{CH$_{2}$-(2-O-C$_{6}$H$_{2}$-$^{ t }$Bu$_{2}$-3,5)}$_{2}$] and alkoxides p-C$_{6}$H$_{4}$CH$_{2}$[OLnL(THF)]$_{2}$ [Ln = Y (5), Yb (6)] supported by an amine-bridged bis(phenolate) ligand have been synthesized through one-pot reactions of Ln(C$_{5}$H$_{5}$)$_{3}$(THF), LH$_{2}$ with p-benzenediol and 1,4-benzenedimethanol, respectively. All complexes have been fully characterized by elemental analyses, single-crystal X-ray diffraction analysis, and IR and multi-nuclear NMR spectroscopy (in the cases of 1, 4 and 5). Study of their catalytic behavior revealed that, in general, all complexes are efficient initiators for the polymerization of rac-lactide (LA) and rac-β-butyrolactone (BBL), except for 3 and 4 in the case of BBL. The influence imposed by lanthanides of different ionic radii and initiating groups of different structures on the activity, controllability, and stereoselectivity of polymerization were systematically studied and compared. Highly heterotactic PLA (P $_{r}$ up to 0.99) and syndiotactic PHB (P $_{r}$ ≈ 0.81) with high molecular weight and narrow polydispersity formed and were automatically capped with hydroxyl functionality at both ends.
Starting Page	1106
Ending Page	1116
Page Count	11
File Format	PDF
ISSN	16747291
Journal	Science in China Series B: Chemistry
Volume Number	57
Issue Number	8
e-ISSN	18691870
Language	English
Publisher	Science China Press
Publisher Date	2014-06-27
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	amine-bridged bis(phenolate) ligand bimetallic lanthanide aryloxides and alkoxides ring-opening polymerization stereoselectivity Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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Synthesis and characterization of amine bridged bis(phenolate) lanthanide aryloxides and their application in the polymerization of lactide

Synthesis and characterization of benzoxazine -functionalized amine bridged bis(phenolate) lanthanide complexes and their application in the ring-opening polymerization of cyclic esters

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Bimetallic amine-bridged bis(phenolate) lanthanide aryloxides and alkoxides: synthesis, characterization, and application in the ring-opening polymerization of rac-lactide and rac-β-butyrolactone

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