Aluminum complexes of mono-pyrrolidine ligands for the con-trolled ring opening polymerization of lactide

James Beament; Mary Mahon; Antoine Buchard; Matthew Jones

doi:10.1021/acs.organomet.8b00161

Aluminum complexes of mono-pyrrolidine ligands for the con-trolled ring opening polymerization of lactide

James Beament, Mary Mahon, Antoine Buchard, Matthew Jones

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Abstract

In this paper we report the full characterization (solution-state NMR spectroscopy and solid-state structures) of a series of Al(III) half-salan complexes and their exploitation for the ring-opening polymerization of rac-lactide. Depending on the ligand employed and stoichiometry of the complexation, structures of the form Al(X) ₂Me or Al(X)Me ₂ were isolated. Interestingly Al(2) ₂Me and Al(2)Me ₂ produce PLA with a strong isotactic bias (P _m up to 0.80), whereas all other complexes produced atactic PLA. This is in contrast to recent studies on similar salan ligand systems. PLAs with predictable molecular weights and narrow distributions were achieved. The results are discussed in terms of steric and electronic properties of the ligands.

Original language	English
Pages (from-to)	1719-1724
Number of pages	6
Journal	Organometallics
Volume	37
Issue number	11
Early online date	22 May 2018
DOIs	https://doi.org/10.1021/acs.organomet.8b00161
Publication status	Published - 11 Jun 2018

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry

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10.1021/acs.organomet.8b00161

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This document is the Accepted Manuscript version of a Published Work that appeared in final form in Organometallics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see DOI: 10.1021/acs.organomet.8b00161.
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title = "Aluminum complexes of mono-pyrrolidine ligands for the con-trolled ring opening polymerization of lactide",

abstract = "In this paper we report the full characterization (solution-state NMR spectroscopy and solid-state structures) of a series of Al(III) half-salan complexes and their exploitation for the ring-opening polymerization of rac-lactide. Depending on the ligand employed and stoichiometry of the complexation, structures of the form Al(X) 2Me or Al(X)Me 2 were isolated. Interestingly Al(2) 2Me and Al(2)Me 2 produce PLA with a strong isotactic bias (P m up to 0.80), whereas all other complexes produced atactic PLA. This is in contrast to recent studies on similar salan ligand systems. PLAs with predictable molecular weights and narrow distributions were achieved. The results are discussed in terms of steric and electronic properties of the ligands. ",

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AU - Buchard, Antoine

AU - Jones, Matthew

PY - 2018/6/11

Y1 - 2018/6/11

N2 - In this paper we report the full characterization (solution-state NMR spectroscopy and solid-state structures) of a series of Al(III) half-salan complexes and their exploitation for the ring-opening polymerization of rac-lactide. Depending on the ligand employed and stoichiometry of the complexation, structures of the form Al(X) 2Me or Al(X)Me 2 were isolated. Interestingly Al(2) 2Me and Al(2)Me 2 produce PLA with a strong isotactic bias (P m up to 0.80), whereas all other complexes produced atactic PLA. This is in contrast to recent studies on similar salan ligand systems. PLAs with predictable molecular weights and narrow distributions were achieved. The results are discussed in terms of steric and electronic properties of the ligands.

AB - In this paper we report the full characterization (solution-state NMR spectroscopy and solid-state structures) of a series of Al(III) half-salan complexes and their exploitation for the ring-opening polymerization of rac-lactide. Depending on the ligand employed and stoichiometry of the complexation, structures of the form Al(X) 2Me or Al(X)Me 2 were isolated. Interestingly Al(2) 2Me and Al(2)Me 2 produce PLA with a strong isotactic bias (P m up to 0.80), whereas all other complexes produced atactic PLA. This is in contrast to recent studies on similar salan ligand systems. PLAs with predictable molecular weights and narrow distributions were achieved. The results are discussed in terms of steric and electronic properties of the ligands.

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Aluminum complexes of mono-pyrrolidine ligands for the con-trolled ring opening polymerization of lactide

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Aluminum complexes of mono-pyrrolidine ligands for the con-trolled ring opening polymerization of lactide

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