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Communication Dans Un Congrès Année : 2019

Photo/Redox Control of π-Dimerization as a Trigger for Molecular and Supramolecular Metamorphism

Résumé

One of the keys to the development of nanoscience is to observe, modify and control mater at the nanoscale. One strategy proposed to meet these immense challenges is to develop responsive molecular or supramolecular systems that can trigger a structural reorganization when exposed to an external stimulus: this phenomenon is known as "metamorphism". Systems with controllable architectures are of great interest in different fields such as molecular electronics, capture and controlled release of guest molecules, or molecular machines. The strategy developed at the Chemistry Laboratory of ENS Lyon is to exploit the switching and assembly properties of π-conjugated organic radicals that can be generated in-situ by electrical or light excitation. 1,2 This concept is based on molecular or supramolecular engineering strategies aiming at promoting the formation of -dimers in solution under usual conditions of temperature and concentration. A first approach consists in connecting viologen subunits with mobile covalent bond in order to guide and facilitate an electron-transfer triggered switching from an open conformation, imposed by intramolecular charge repulsion, to a folded form stabilized by the formation of an intramolecular -dimer between two cationic radicals. Another approach consists in favoring the formation of π-dimers inside cavitands molecules such as cucurbituril in order to control the reversible association/dissociation of molecular building blocks into 2D-supramolecular assembly. These strategies are very promising for the development of new soft-materials with switchable properties. (1) Kahlfuss, C.; Gibaud, T.; Denis-Quanquin, S.; Chowdhury, S.; Royal, G.; Chevallier, F.; Saint-Aman, E.; Bucher, C. Redox-Induced Molecular Metamorphism Promoting a Sol/Gel Phase Transition in a Viologen-Based Coordination Polymer. Chem. Eur. J. 2018, 24 (49), 13009-13019. https://doi.org/10.1002/chem.201802334. (2) Chowdhury, S.; Nassar, Y.; Guy, L.; Frath, D.; Chevallier, F.; Dumont, E.; Ramos, A. P.; Demets, G. J.-F.; Bucher, C. Photo/Redox-Responsive 2D-Supramolecular Assembly Involving Cucurbit[8]Uril and a Star-Shaped Porphyrin Tecton. Electrochim. Acta 2019, 316, 79-92.

Domaines

Chimie
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Dates et versions

hal-02301752 , version 1 (30-09-2019)

Identifiants

  • HAL Id : hal-02301752 , version 1

Citer

Denis Frath, Thomas Gibaud, Clément Roizard, Shagor Chowdhury, Youssef Nassar, et al.. Photo/Redox Control of π-Dimerization as a Trigger for Molecular and Supramolecular Metamorphism. NanoSynergetics Workshop - 9th International Symposium On Photochromism (ISOP), Sep 2019, Paris, France. ⟨hal-02301752⟩
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