Synthesis and structural characterization of magnesium ketiminate complexes: Efficient initiators for the ring-opening polymerization of L-lactide

Hui Yi Tang, Hsuan Ying Chen, Jui-Hsien Huang, Chu Chieh Lin

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

A series of dinuclear magnesium complexes of the type [LMg(μ-OBn)] 2 (where L = NNO-tridentate ketiminate ligand) have been prepared. Their activities toward the ring-opening polymerization of L-lactide have been investigated. Experimental results indicate that the reactivity of [LMg(μ -OBn)]2 is dramatically affected by the steric and electronic effect of the substituents on the ketiminate ligand. On the basis of the melting point depression and variable-temperature 1H NMR studies, it is believed that these magnesium complexes exist as an equilibrium between a monomeric and a dimeric species in solution in which the monomeric species is the most active species during polymerization. The polymerization probably proceeds with the coordination of the lactide to the monomeric species giving a five-coordinated magnesium complex as an intermediate.

Original languageEnglish
Pages (from-to)8855-8860
Number of pages6
JournalMacromolecules
Volume40
Issue number25
DOIs
Publication statusPublished - 2007 Dec 11

Fingerprint

Ring opening polymerization
Magnesium
Ligands
Polymerization
Melting point
Nuclear magnetic resonance
dilactide
Temperature

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

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abstract = "A series of dinuclear magnesium complexes of the type [LMg(μ-OBn)] 2 (where L = NNO-tridentate ketiminate ligand) have been prepared. Their activities toward the ring-opening polymerization of L-lactide have been investigated. Experimental results indicate that the reactivity of [LMg(μ -OBn)]2 is dramatically affected by the steric and electronic effect of the substituents on the ketiminate ligand. On the basis of the melting point depression and variable-temperature 1H NMR studies, it is believed that these magnesium complexes exist as an equilibrium between a monomeric and a dimeric species in solution in which the monomeric species is the most active species during polymerization. The polymerization probably proceeds with the coordination of the lactide to the monomeric species giving a five-coordinated magnesium complex as an intermediate.",
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Synthesis and structural characterization of magnesium ketiminate complexes : Efficient initiators for the ring-opening polymerization of L-lactide. / Tang, Hui Yi; Chen, Hsuan Ying; Huang, Jui-Hsien; Lin, Chu Chieh.

In: Macromolecules, Vol. 40, No. 25, 11.12.2007, p. 8855-8860.

Research output: Contribution to journalArticle

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T1 - Synthesis and structural characterization of magnesium ketiminate complexes

T2 - Efficient initiators for the ring-opening polymerization of L-lactide

AU - Tang, Hui Yi

AU - Chen, Hsuan Ying

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AU - Lin, Chu Chieh

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AB - A series of dinuclear magnesium complexes of the type [LMg(μ-OBn)] 2 (where L = NNO-tridentate ketiminate ligand) have been prepared. Their activities toward the ring-opening polymerization of L-lactide have been investigated. Experimental results indicate that the reactivity of [LMg(μ -OBn)]2 is dramatically affected by the steric and electronic effect of the substituents on the ketiminate ligand. On the basis of the melting point depression and variable-temperature 1H NMR studies, it is believed that these magnesium complexes exist as an equilibrium between a monomeric and a dimeric species in solution in which the monomeric species is the most active species during polymerization. The polymerization probably proceeds with the coordination of the lactide to the monomeric species giving a five-coordinated magnesium complex as an intermediate.

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