Reversible pH-Controlled Catenation of a Benzobisimidazole-based Tetranuclear Rectangle.
Fiche publication
Date publication
septembre 2021
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
Auteurs
Membres identifiés du Cancéropôle Est :
Dr ELHABIRI Mourad
Tous les auteurs :
Goeb S, Sallé M, Siri O, Pascal S, Dekhtiarenko M, Elhabiri M, Mazan V, Canevet D, Allain M, Carré V, Aubriet F, Voitenko Z
Lien Pubmed
Résumé
The development of methodologies to control on demand and reversibly supramolecular transformations from self-assembled metalla-structures requires the rational design of architectures able to answer to an applied stimulus. While solvent, concentration, guest, light, addition of a chemical have been largely explored to provide these transformations, the case of pH sensitive materials is less described. Herein, we report the first example of a pH-triggered dissociation of a coordination-driven self-assembled interlocked molecular link. It incorporates a pH sensitive benzobisimidazole-based ligand that can be selectively protonated on its bisimidazole moieties. This generates intermolecular electrostatic repulsions that reduces drastically the stability of the interlocked structure, leading to its dissociation without any sign of protonation of the basic pyridine moieties involved in the coordination bonds. Importantly, the dissociation process is reversible through addition of a base.
Mots clés
Benzobis(imidazole), Metalla-cycles, Self-assembly, host-guest systems, pH
Référence
Chemistry. 2021 Sep 3;: