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Article Dans Une Revue European Polymer Journal Année : 2015

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

Résumé

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. In both cases a dramatic colour change occurs from intense blue-green to colourless.
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Dates et versions

hal-02484467 , version 1 (08-12-2023)

Identifiants

Citer

Aurélie Malfait, Fanny Coumes, David Fournier, Graeme Cooke, Patrice Woisel. A water-soluble supramolecular polymeric dual sensor for temperature and pH with an associated direct visible readout. European Polymer Journal, 2015, 69 (23), pp.552-558. ⟨10.1016/j.eurpolymj.2015.02.033⟩. ⟨hal-02484467⟩
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