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Anionic Iron(II) Alkoxides as Initiators for the Controlled Ring-Opening Polymerization of Lactide
journal contribution
posted on 2023-05-16, 19:50 authored by McGuinness, DS, Marshall, EL, Gibson, VC, Steed, JWHetero-bimetallic Fe(II) alkoxide/aryloxides were evaluated as initiators for the ring-opening polymerization of rac-lactide. [(THF)NaFe(OtBu)3]2 (1) and [(THF)4Na2Fe(2,6-diisopropylphenolate)4] (2) (THF = tetrahydrofuran) both polymerized lactide efficiently at room temperature, with complex 1 affording better control over the molecular weight parameters of the resultant polymer. At conversions below 70%, a linear increase in molecular weight with conversion was observed, indicative of a well-controlled polymerization process. Complex 2 is the first example of a dianionic Fe(II) alkoxide and has been structurally characterized to reveal a distorted square planar FeO4 array in which both Na counterions bridge two aryloxide ligands and are further complexed by two THF ligands.
History
Publication title
Journal of Polymer Science Part A - Polymer ChemistryVolume
41Issue
23Pagination
3798-3803ISSN
0887-624XDepartment/School
School of Natural SciencesPublisher
WileyPlace of publication
Hoboken, NJ, USARepository Status
- Restricted