KRIAT, Amine; PASCAL, Simon; KAUFFMANN, Brice; FERRAND, Yann; BERGE-LEFRANC, David; GIGMES, Didier; SIRI, Olivier; KERMAGORET, Anthony; BARDELANG, David

doi:10.1002/chem.202300633

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KRIAT, Amine

PASCAL, Simon

KAUFFMANN, Brice
Soutien à la Recherche de l'Institut Européen de Chimie Biologique

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Chemistry - A European Journal. 2023p. e202300633

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The structure of the Viologen-Phenylene-Imidazole (VPI) guest, previously shown to be bound by cucurbit[7]uril (CB[7]) with binding modes depending on pH and silver ions, has been extended by adding hydrophobic groups on the two extremities of VPI before investigations of CB[7] binding by NMR, ITC, X-ray diffraction, UV-vis and fluorescence spectroscopies. With an imidazole station extended by a naphthalene group (VPI-N), binding modes of CB[7] are similar to those previously observed. However, with the viologen extended by a tolyl group (T-VPI), CB[7] preferentially sits on station T, shuttling between the T and P stations at acid pH or after Ag + addition. The CB[7]•T-VPI complex thus behaves as a metal-actuated thermodynamic stop-and-go molecular shuttle featured by fast and autonomous ring translocation between two stations and a continuum for fractional station occupancy solely and easily controlled by Ag + concentration.< Leer menos

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A pH-and Metal-Actuated Molecular Shuttle in Water

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