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.
Domains
Chemical Sciences
Fichier principal
Chemistry A European J - 2023 - Kriat - A pH‐ and Metal‐Actuated Molecular Shuttle in Water.pdf (4)
Télécharger le fichier
Origin | Publication funded by an institution |
---|---|
Licence |