Bis(calixcrown)tetrathiafulvalene receptors.
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.
Blesa
María-Jesús
MJ
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).
Zhao
Bang-Tun
BT
Allain
Magali
M
Le Derf
Franck
F
Sallé
Marc
M