Zirconium vs aluminum salalen initiators for the production of biopolymers

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Abstract

Herein we report the synthesis and full characterization (NMR and solid-state structures) for a series of Zr(IV), Hf(IV), and Al(III) salalen complexes, together with salen bimetallic counterparts. With the salalen ligand, 1H2, monometallic complexes were observed in solution and solid state. Complex Zr(1)(OiPr)2 was able to produce isotactic polylactide (PLA) from rac-lactide (Pm up to 0.85) in solution at 50 °C; in the melt (130 °C) this reduced to ca. 0.75. Al(1)Me was significantly less active and produced PLA with only a very modest isotactic enchainment (Pm ≈ 0.6). Zr(1)(OiPr)2 was also able to produce copolymers with lactide and ϵ-caprolactone, producing copolymers of a "blocky" nature.

Original languageEnglish
Pages (from-to)3837-3843
Number of pages7
JournalOrganometallics
Volume35
Issue number22
DOIs
Publication statusPublished - 28 Nov 2016

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Biopolymers
biopolymers
initiators
Aluminum
copolymers
Copolymers
solid state
aluminum
Nuclear magnetic resonance
Ligands
nuclear magnetic resonance
ligands
synthesis
poly(lactide)
dilactide
disalicylaldehyde ethylenediamine
caprolactone

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Zirconium vs aluminum salalen initiators for the production of biopolymers. / Kirk, Sarah M.; Kociok-Kohn, Gabriele; Jones, Matthew D.

In: Organometallics, Vol. 35, No. 22, 28.11.2016, p. 3837-3843.

Research output: Contribution to journalArticle

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