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Journal Articles Chemistry - A European Journal Year : 2023

A pH‐ and Metal‐Actuated Molecular Shuttle in Water

Abstract

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.
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hal-04615234 , version 1 (18-06-2024)

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Amine Kriat, Simon Pascal, Brice Kauffmann, Yann Ferrand, David Bergé-Lefranc, et al.. A pH‐ and Metal‐Actuated Molecular Shuttle in Water. Chemistry - A European Journal, 2023, 29 (33), pp.e202300633. ⟨10.1002/chem.202300633⟩. ⟨hal-04615234⟩
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