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Vanadium(v) phenolate complexes for ring opening homo- and co-polymerisation of ε-caprolactone, L-lactide and rac-lactide

Ge, Feijie; Dan, Yi; Al-Khafaji, Yahya; Prior, Timothy J.; Jiang, Long; Elsegood, Mark R. J.; Redshaw, Carl

Authors

Feijie Ge

Yi Dan

Yahya Al-Khafaji

Long Jiang

Mark R. J. Elsegood

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry



Abstract

The vanadyl complexes [VO(OtBu)L¹ ] (1) and {[VO(OiPr)]₂ (μ-p-L²ᵖ)} (2) {[VO(OR)]₂ (μ-p-L²ᵐ )} (R = iPr 3, tBu 4) have been prepared from [VO(OR)₃ ] (R = nPr, iPr or tBu) and the respective phenol, namely 2,2′-ethylidenebis(4,6-di-tert-butylphenol) (L¹ H₂ ) or α,α,α′,α′-tetra(3,5-di-tert-butyl-2-hydroxyphenyl–p/m-)xylene-para-tetraphenol (L2p/mH₄). For comparative studies, the known complexes [VO(μ-OnPr)L¹]₂ (I), [VOL³ ]₂ (II) (L³H₃ = 2,6-bis(3,5-di-tert-butyl-2-hydroxybenzyl)-4-tert-butylphenol) were prepared. An imido complex {[VCl(Np-tolyl)(NCMe)]₂(μ-p-L²ᵖ)} (5) has been prepared following work-up from [V(Np-tolyl)Cl₃ ], L²ᵖH₄ and Et₃ N. The molecular structures of complexes 1–5 are reported. Complexes 1–5 and I and II have been screened for their ability to ring open polymerise ε-caprolactone, L-lactide or rac-lactide with and without solvent present. The co-polymerization of ε-caprolactone with L-lactide or rac-lactide afforded co-polymers with low lactide content; the reverse addition was ineffective.

Citation

Ge, F., Dan, Y., Al-Khafaji, Y., Prior, T. J., Jiang, L., Elsegood, M. R. J., & Redshaw, C. (2016). Vanadium(v) phenolate complexes for ring opening homo- and co-polymerisation of ε-caprolactone, L-lactide and rac-lactide. RSC advances, 6(6), 4792-4802. https://doi.org/10.1039/c5ra24816g

Journal Article Type Article
Acceptance Date Dec 17, 2015
Online Publication Date Dec 22, 2015
Publication Date 2016
Deposit Date Jan 19, 2016
Publicly Available Date Nov 23, 2017
Journal RSC advances
Print ISSN 2046-2069
Electronic ISSN 2046-2069
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 6
Pages 4792-4802
DOI https://doi.org/10.1039/c5ra24816g
Keywords Vanadium(V) phenolate complexes, Co-polymerisation, ε-caprolactone, L-lactide, Rac-lactide
Public URL https://hull-repository.worktribe.com/output/384190
Publisher URL http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C5RA24816G#!divAbstract

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