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Recyclablel-proline functional nanoreactors with temperature-tuned activity based on core–shell nanogels
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Lu, Annhelen, Moatsou, Dafni, Hands-Portman, Ian, Longbottom, Deborah A. and O’Reilly, Rachel K. (2014) Recyclablel-proline functional nanoreactors with temperature-tuned activity based on core–shell nanogels. ACS Macro Letters, 3 (12). pp. 1235-1239. doi:10.1021/mz500704y ISSN 2161-1653.
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Official URL: http://dx.doi.org/10.1021/mz500704y
Abstract
Recyclable core–shell (CS) nanogels based on l-proline-containing hydrophobic cores with a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) shell have been synthesized via a seeded precipitation polymerization process. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) were used to verify the successful addition of the shell and investigate the thermoresponsive properties of the nanostructures. The catalytic activity of the nanogels was assessed in a model asymmetric aldol reaction, where an enhancement was observed with increasing temperature, attributed to the hydrophobic nature of the PNIPAM shell. However, when a nanogel was synthesized with core–shell morphology based on a gradient of cross-linking density in the corona (GS), a dramatic drop in activity was observed at elevated temperatures: the collapse of the outer, lightly cross-linked, “corona” polymer chains appears to block access to the catalytic core. High activity and enantioselectivity were maintained in a number of recovery and reuse cycles, highlighting the recycling potential of these catalytic nanostructures.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||||
Journal or Publication Title: | ACS Macro Letters | ||||||||
Publisher: | American Chemical Society | ||||||||
ISSN: | 2161-1653 | ||||||||
Official Date: | 7 November 2014 | ||||||||
Dates: |
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Volume: | 3 | ||||||||
Number: | 12 | ||||||||
Page Range: | pp. 1235-1239 | ||||||||
DOI: | 10.1021/mz500704y | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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