Fiche publication
Date publication
juin 2025
Journal
Journal of the American Chemical Society
Auteurs
Membres identifiés du Cancéropôle Est :
Pr LEHN Jean-Marie
Tous les auteurs :
Han Z, He M, Lehn JM, Li Q
Lien Pubmed
Résumé
Dynamically adaptive materials that respond to varying environmental stimuli have garnered significant attention due to their potential applications. Nevertheless, developing single-molecule-based intrinsically adaptive materials capable of responding to multiple stimuli remains a challenge. Herein, we present an intrinsically adaptive salicylaldimine featuring a urea group, demonstrating versatile adaptations across three different stacking states in response to light, mechanical, and thermal stimuli, thus facilitating controllable switching between photochromism and photoluminescence. Such adaptations are enabled by intermolecular hydrogen bonds between urea groups, which play a crucial role in modulating molecular stacking configurations. Specifically, the pristine imine in crystal I state exhibits fluorescence quenching but demonstrates visible-light-driven reversible photochromism. Mechanical grinding disrupts the robust intermolecular hydrogen bond, deactivating photochromism while activating photoluminescence. The resulting imine powder in amorphous state displays bright fluorescence and can be reverted to the initial crystal I state either through exposure to ethanol vapor or thermal annealing of imine at 60 °C. Remarkably, a new stable crystalline state, crystal II, emerges after the thermal annealing of imine at an exceptionally high temperature of 240 °C with 21.5-fold fluorescence enhancement compared to imine in crystal I state. These versatile adaptations underscore its potential for applications in anticounterfeiting, information encryption, and high-temperature recording. Overall, these findings provide valuable insights into strategies for the development of intrinsically adaptive systems and materials.
Référence
J Am Chem Soc. 2025 06 12;:
