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A Supramolecular Photonic Crystal Hydrogel Based on Host-Guest Interaction for Organic Molecules Recognition

Abstract

Host component β-cyclodextrin (β-CD) and guest component tertiary-butyl (t-Bu) were introduced into polymeric backbone material of an inverse opal hydrogel. The association between β-CD and t-Bu functions as an openable cross-linker (“lock”) in hydrogel. Meeting a competitive guest as the target molecule, 1-admantanecarboxylic acid sodium salt (AdCANa) acts as a “key” to dissociate the pair of β-CD and t-Bu due to its stronger combination capacity with the β-CD than the t-Bu. At the same time, another cross-linker N,N-methylenebisacrylamide (MBAAm) provides covalent bonds to the backbone material, ensuring the subsequent association/dissociation between the host-guest pair only results in an expansion-contraction in volume, rather than a sol-gel phase transition. In this way, the target molecule acting as a competitive guest can cause expansion-induced structural color change of the inverse opal hydrogel. Following the same strategy, the L- and D-enatiomers of tryptophan (Try) can also be recognized. The combination between the supramolecular host-guest pair and photonic crystals promises applicability in molecular recognition and other interesting optical devices.

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Supplementary files

Article information


Submitted
22 Sep 2020
Accepted
11 Oct 2020
First published
13 Oct 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Communication

A Supramolecular Photonic Crystal Hydrogel Based on Host-Guest Interaction for Organic Molecules Recognition

K. Song, Y. Sun, D. Wang, Y. Long, L. Li, K. Du, K. Hou, J. Ji, C. Yang, K. Zhong, H. Cai and J. Li, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC04517A

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