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Using Aggregation-Induced Emission to Understand Dipeptide Gels

1
Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, UK
2
School of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 1 February 2018 / Accepted: 7 February 2018 / Published: 9 February 2018
(This article belongs to the Special Issue Supramolecular Gels)
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Abstract

We describe the formation of structured liquids and gels from a functionalised dipeptide based on tetraphenylethylene. Tetraphenylethylene is well-known to be able to undergo aggregation-induced emission. We use the emission data to understand the behaviour of the dipeptide in water under a variety of conditions. The dipeptide forms viscous solutions at high pH. Gels can be formed by a pH-trigger, but syneresis occurs. Addition of a calcium salt also leads to a gel with slight syneresis. Addition of sodium chloride leads to a self-supporting material, but this is not a true gel from the rheological perspective. From the emission data, we infer that there are limited structural changes on addition of sodium chloride or acid, but there are significant changes in molecular packing when the gel is formed by addition of a calcium salt. View Full-Text
Keywords: hydrogel; self-assembly; supramolecular; aggregation; fluorescence hydrogel; self-assembly; supramolecular; aggregation; fluorescence
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Castilla, A.M.; Dietrich, B.; Adams, D.J. Using Aggregation-Induced Emission to Understand Dipeptide Gels. Gels 2018, 4, 17.

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