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Phosphasalen yttrium complexes: Highly active and stereoselective initiators for lactide polymerization


Reference:

Cao, T.-P.-A., Buchard, A., Le Goff, X. F., Auffrant, A. and Williams, C. K., 2012. Phosphasalen yttrium complexes: Highly active and stereoselective initiators for lactide polymerization. Inorganic Chemistry, 51 (4), pp. 2157-2169.

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http://dx.doi.org/10.1021/ic202015z

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Abstract

Preparation and characterization of three yttrium alkoxide complexes with new phosphasalen ligands are reported. The phosphasalens are analogues of the well-known salen ligands but with iminophosphorane donors replacing the imine functionality. The three yttrium alkoxide complexes show mono- and dinuclear structures in the solid state, depending on the substituents on the ligand. The new ligands and complexes are characterized using multinuclear NMR spectroscopy, mass spectrometry, elemental analysis, and single-crystal X-ray diffraction experiments. The complexes are all rapid initiators for lactide polymerization; they show excellent polymerization control on addition of exogeneous alcohol. The mononuclear complex shows extremely rapid rates and a high degree of stereocontrol in rac-lactide polymerization, yielding heterotactic PLA (Ps of 0.9). The phosphasalens are, therefore, excellent ligands for lactide ring-opening polymerization catalysis showing superior rates and stereocontrol versus salen ligands, which may be related to their excellent donating ability and the high degrees of steric protection they can confer.

Details

Item Type Articles
CreatorsCao, T.-P.-A., Buchard, A., Le Goff, X. F., Auffrant, A. and Williams, C. K.
DOI10.1021/ic202015z
Related URLs
URLURL Type
http://www.scopus.com/inward/record.url?scp=84857700566&partnerID=8YFLogxKUNSPECIFIED
DepartmentsFaculty of Science > Chemistry
Research CentresCentre for Sustainable Chemical Technologies
RefereedYes
StatusPublished
ID Code34571

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