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Bis(calixcrown)tetrathiafulvalene receptors
Authors:Blesa María-Jesús  Zhao Bang-Tun  Allain Magali  Le Derf Franck  Sallé Marc
Institution:Laboratoire de Chimie et Ingénierie Moléculaire des Matériaux d'Angers (CIMMA), Groupe Synthèse Organique et Matériaux Fonctionnels, UMR CNRS 6200, Université d'Angers, 2 Bd Lavoisier, 49045 Angers (France).
Abstract:A new class of electroactive receptors has been synthesized, built by covalent association of five subunits: two calixarene platforms for spatial organization, two polyether 3D cavities for cation binding, and one electroactive TTF unit to probe the complexation event. Sodium complexation induces rigidification of the molecular assembly, as shown by 1H NMR titration and single-crystal X-ray crystallographic studies on free receptor 14 and a corresponding complex with two bound sodium atoms per receptor (15-(NaPF6)2). The calixarene units in these receptors change from a pinched cone conformation in the free ligand to a symmetrical cone in the complex. Cyclovoltammetric studies validated the electrochemical recognition concept of these five-member assemblies.
Keywords:calixarenes  crown compounds  cyclic voltammetry  host–guest systems  receptors
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