A water-soluble supramolecular polymeric dual sensor for temperature and pH with an associated direct visible readout

Malfait, A., Coumes, F., Fournier, D., Cooke, G. and Woisel, P. (2015) A water-soluble supramolecular polymeric dual sensor for temperature and pH with an associated direct visible readout. European Polymer Journal, 69, pp. 552-558. (doi: 10.1016/j.eurpolymj.2015.02.033)

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We report a multi-stimuli responsive polymeric sensor consisting of a pseudorotaxane-like architecture fabricated from a 1,5-diaminonaphthalene end-functionalized poly(N-isopropyl)acrylamide (Napht-N-PNIPAM) and cyclobis(paraquat-p-phenylene) (CBPQT4+,4Cl-). The coloured nature of the poly-pseudorotaxane provides a sensor for temperature and pH in water with an associated visible readout. To create this dual responsive polymeric sensor, a new chain transfer agent (Napht-N-CTA) incorporating a pH-responsive 1,5-diaminonaphthalene unit was synthesized and used for the polymerization of N-isopropylacrylamide via Reversible Addition-Fragmentation Chain Transfer (RAFT). The ability of Napht-N-PNIPAM to form a pseudorotaxane architecture with CBPQT4+,4Cl- in aqueous media was studied by means of UV-Vis, NMR (1H, 2D-ROESY, DOSY) and ITC experiments. Interestingly, the pseudorotaxane architecture can be reversibly dissociated upon either heating the sample above its cloud point or protonating the nitrogen atoms of the 1,5-diaminonaphthalene-based guest unit by adjusting the pH to around 1. ln both cases a dramatic colour change occurs from intense blue-green to colourless.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cooke, Professor Graeme and Woisel, Prof Patrice
Authors: Malfait, A., Coumes, F., Fournier, D., Cooke, G., and Woisel, P.
College/School:College of Science and Engineering
College of Science and Engineering > School of Chemistry
Journal Name:European Polymer Journal
ISSN (Online):1873-1945
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in European Polymer Journal 69:552-558
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
445041Physical organic chemistry - opportunities in synthesis, materials and pharmaceuticalsGraeme CookeEngineering & Physical Sciences Research Council (EPSRC)EP/E036244/1CHEM - CHEMISTRY