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Self-assembling unsymmetrical bis-ureas
journal contribution
posted on 2023-06-09, 11:59 authored by Kelly Melia, Barnaby GreenlandBarnaby Greenland, Daniel Hermida-Merino, Lewis R Hart, Ian W Hamley, Howard M Colquhoun, Andrew T Slark, Wayne HayesModel compounds of unsymmetrical bis-ureas have been designed and synthesised to investigate and further understand the formation of supramolecular polymer arrays. Association constants (< 200 M- 1) for the bis- ureas have been determined by 1H NMR spectroscopy, and further characterised by optical spectroscopy. In addition, SAXS analysis of the bulk material reveals the formation of different highly ordered structures de- monstrating complex hydrogen bonding of these unsymmetrical materials. Thermal transitions are also observed in some examples of unsymmetrical bis-ureas near to the melting point, as evidenced by double endotherms in DSC analysis. We also propose a re-organisation mechanism whereby the supramolecular array is first altered before proceeding to melt which is supported by variable temperature SAXS analysis.
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Publication status
- Published
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- Published version
Journal
Reactive and Functional PolymersISSN
1381-5148Publisher
ElsevierVolume
124Page range
156-161Department affiliated with
- Chemistry Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2018-02-07First Compliant Deposit (FCD) Date
2018-02-07Usage metrics
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