Abdessamad Arbaoui
Iron(III) and Zinc(II) calixarene complexes: Synthesis, structural studies, and use as procatalysts for ε-caprolactone polymerization
Arbaoui, Abdessamad; Redshaw, Carl; Elsegood, Mark R. J.; Wright, Victoria E.; Yoshizawa, Akina; Yamato, Takehiko
Authors
Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry
Mark R. J. Elsegood
Victoria E. Wright
Akina Yoshizawa
Takehiko Yamato
Abstract
Treatment of the heterobimetallic iron(II) alkoxides [(THF)MFe(OtBu)3]2 with p-tert-butylcalix[4]areneH4 (L1H4) affords the oxo-bridged diiron(III) complexes {Fe[M(NCMe)x]2L1}2(μ-O), M=Na, x=2 1⋅8(CH3CN), M= K, x=3 2⋅3.5(CH3CN); similar use of p-tert-butylcalix[6]areneH6 (L2H6) afforded [{Fe2(μ-O)Na2(OH2)(NCMe)2L2}2][{Fe2(μ-O)Na(OH2)(NCMe)6L2}2]2-[Na(NCMe)5]22+3⋅9.46(CH3CN) and [{Fe2(μ-O)L2(K(NCMe)2)2}2] 4⋅10.8(MeCN), respectively. In the case of 4, a minor product {(L22Fe8O8)[K(NCMe)1.5K(H2O)(NCMe)2.5]2} 5⋅6(CH3CN), which is comprised of chains of (L22Fe8O8) clusters bridged by K/MeCN fragments, is also isolated. Use of p-tert-butylcalix[8]areneH8 (L3H8) and two equivalents of [(THF)KFe(OtBu)3]2 affords [(K2(μ-NCCH3)4(μ-OH2))2(Fe2(μ-O)L3H2)2(CH3CN)2] 6⋅9(CH3CN). In the case of p-tert-butyltetrahomodioxacalix[6]areneH6 (L4H6), reaction with [(THF)MFe(OtBu)3]2 (two equivalents) leads to isolation of the pseudoisomorphic complexes [M2(CH3CN)4L4Fe2(μ-O)].4CH3CN M=Na 7⋅4(CH3CN), M=K 8⋅2(CH3CN); similar use of p-tert-butylhexahomotrioxacalix[3]areneH3 (L5H3) led to [Na2Fe2(μ-OH)2(L5)2(CH3CN)4] 9⋅2(CH2Cl2). The complex [L4(ZnEt)4Zn2(CH3CN)4(μ-OEt)2], 10⋅2(CH3CN), isolated from the reaction of L4H6 and ZnEt2 is also reported. Complexes 1–10 are structurally characterized (partially in the case of 4) and screened (not 5) as catalysts for the ring opening polymerization of ε-caprolactone.
Citation
Arbaoui, A., Redshaw, C., Elsegood, M. R. J., Wright, V. E., Yoshizawa, A., & Yamato, T. (2010). Iron(III) and Zinc(II) calixarene complexes: Synthesis, structural studies, and use as procatalysts for ε-caprolactone polymerization. Chemistry - An Asian Journal, 5(3), 621-633. https://doi.org/10.1002/asia.200900514
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 30, 2009 |
Online Publication Date | Jan 27, 2010 |
Publication Date | Feb 22, 2010 |
Deposit Date | Nov 13, 2014 |
Journal | Chemistry-An Asian Journal |
Print ISSN | 1861-4728 |
Electronic ISSN | 1861-471X |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 5 |
Issue | 3 |
Pages | 621-633 |
DOI | https://doi.org/10.1002/asia.200900514 |
Keywords | Calixarenes; Crystal growth; Heterometallic complexes; Iron; Polymerization |
Public URL | https://hull-repository.worktribe.com/output/468221 |
Publisher URL | https://onlinelibrary.wiley.com/doi/abs/10.1002/asia.200900514 |
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