Efficient ring-opening polymerization (ROP) of ε-caprolactone catalysed by isomeric pyridyl β-diketonate iron(iii) complexes

Sze-Ling Lee; Fei-Long Hu; Xiu-Juan Shang; Yi-Xiang Shi; Ai Ling Tan; Jens Mizera; Jack K Clegg; Wen-Hua Zhang; David James Young; Jian-Ping Lang

doi:10.1039/c7nj03571c

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Efficient ring-opening polymerization (ROP) of ε-caprolactone catalysed by isomeric pyridyl β-diketonate iron(iii) complexes

Journal article

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Efficient ring-opening polymerization (ROP) of ε-caprolactone catalysed by isomeric pyridyl β-diketonate iron(iii) complexes

Sze-Ling Lee, Fei-Long Hu, Xiu-Juan Shang, Yi-Xiang Shi, Ai Ling Tan, Jens Mizera, Jack K Clegg, Wen-Hua Zhang, David James Young and Jian-Ping Lang

New Journal of Chemistry, Vol.41(23), pp.14457-14465

2017

DOI: https://doi.org/10.1039/c7nj03571c

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Abstract

A series of Fe(III) complexes of β-diketonate ligands, 1-(2-pyridyl)-3-(3-pyridyl)-1,3-propanedione (L1), 1-(2-pyridyl)-3-(2-pyridyl)-1,3-propanedione (L2), 1-(2-pyridyl)-3-(4-pyridyl)-1,3-propanedione (L3), 1-(3-pyridyl)-3-(4-pyridyl)-1,3-propanedione (L4), 1-(3-pyridyl)-3-(3-pyridyl)-1,3-propanedione (L5) and 1-(4-pyridyl)-3-(4-pyridyl)-1,3-propanedione (L6), viz. [Fe(L1)3] (1), [Fe(L2)3] (2), [Fe(L3)3] (3), [Fe(L4)3] (4), [Fe(L5)3] (5) and [Fe(L6)3] (6) have been structurally characterized. All but one complex (1) catalyzed the ring-opening polymerization (ROP) of Îµ-caprolactone (Îµ-CL) in near quantitative yield at 110 °C to give polymers with relatively narrow polydispersities (PDI). The comparison of in situ reaction and a reaction with preformed 1 indicated that the latter was a better catalyst, giving a higher molecular weight. Complex 2 catalyzed this reaction in a more modest yield reflecting its greater thermal stability, shorter Fe-O bonds and minimal distortion in fold angle among the isomeric complexes, suggesting that ligand dissociation is important for catalytic activity.

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Title: Efficient ring-opening polymerization (ROP) of ε-caprolactone catalysed by isomeric pyridyl β-diketonate iron(iii) complexes
Authors: Sze-Ling Lee (Author) - Universiti Brunei Darussalem, Brunei
Fei-Long Hu (Author) - Soochow University, People's Republic of China
Xiu-Juan Shang (Author) - Soochow University, People's Republic of China
Yi-Xiang Shi (Author) - Soochow University, People's Republic of China
Ai Ling Tan (Author) - Universiti Brunei Darussalem, Brunei
Jens Mizera (Author) - Technical University Dresden, Germany
Jack K Clegg (Author) - University of Queensland
Wen-Hua Zhang (Author) - Universiti Brunei Darussalem, Brunei
David James Young (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Jian-Ping Lang (Author) - Soochow University, People's Republic of China
Publication details: New Journal of Chemistry, Vol.41(23), pp.14457-14465
Publisher: Royal Society of Chemistry (R S C) Publications
Date published: 2017
DOI: 10.1039/c7nj03571c
ISSN: 1144-0546
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99451067402621
Output Type: Journal article

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