Publication: Highly efficient metal(iii) porphyrin and salen complexes for the polymerization of: Rac -lactide under ambient conditions
Issued Date
2019-01-01
Resource Type
ISSN
14779234
14779226
14779226
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2-s2.0-85062408715
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Mahidol University
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SCOPUS
Bibliographic Citation
Dalton Transactions. Vol.48, No.10 (2019), 3223-3230
Suggested Citation
Siriwan Praban, Parichat Piromjitpong, Vagulejan Balasanthiran, Savithra Jayaraj, Malcolm H. Chisholm, Jonggol Tantirungrotechai, Khamphee Phomphrai Highly efficient metal(iii) porphyrin and salen complexes for the polymerization of: Rac -lactide under ambient conditions. Dalton Transactions. Vol.48, No.10 (2019), 3223-3230. doi:10.1039/c8dt04699a Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/50596
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Title
Highly efficient metal(iii) porphyrin and salen complexes for the polymerization of: Rac -lactide under ambient conditions
Abstract
© 2019 The Royal Society of Chemistry. Ligated metal(iii) complexes, Al(iii), In(iii), Cr(iii), and Co(iii), containing tetraphenylporphyrin (TPP) and cyclohexylsalen (Cy-salen) ligands were investigated for the polymerization of rac-lactide (rac-LA). A combination of metal complexes, co-catalyst, and co-initiator was shown to be highly efficient for the ring-opening polymerization of rac-LA at room temperature. Influences of metal centers, ligands, and co-catalysts were investigated. Higher Lewis acidity of metal centers and ligands enhanced catalytic activity. Ionic co-catalysts showed increased polymerization rates. Polymerization of rac-LA catalyzed by tetraphenylporphyrin aluminum chloride ((TPP)AlCl) and bis(triphenylphosphine)iminium chloride (PPN + Cl - ) in cyclohexene oxide (CHO) as a solvent produced isotactic-enriched polylactide. The order of reactivities based on the metals supported by the TPP ligand is Cr(iii) > Al(iii) > In(iii) > Co(iii) while the reactivities of the catalysts supported by Cy-salen ligands are in the order In(iii) > Cr(iii) > Al(iii) > Co(iii).
