Titre :

Fluorescence modulation of pyridinium betaines: a mechanofluorochromic investigation

Auteur(s) :

Mcdonald, P. W. [Auteur]
Monash university
Xu, J. J. [Auteur]
Shanghai Normal University [SHNU]
Lonsdale, D. R. [Auteur]
University of Melbourne
Jones, I. [Auteur]
The University of Western Australia [UWA]
Poggi, B. [Auteur]
Université Paris-Saclay
Cox, R. P. [Auteur]
Monash university
Aloise, Stephane [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Scully, A. D. [Auteur]
Commonwealth Scientific and Industrial Research Organisation [Australia] [CSIRO]
Allain, C. [Auteur]
Université Paris-Saclay
Bodelot, L. [Auteur]
Institut Polytechnique de Paris [IP Paris]
Moggach, S. A. [Auteur]
The University of Western Australia [UWA]
Bell, T. D. M. [Auteur]
Monash university
Métivier, R. [Auteur]
Université Paris-Saclay
Furness, S. G. B. [Auteur]
Monash Institute of Pharmaceutical Sciences [Parkville] [MIPS]
The University of Queensland [UQ [All campuses : Brisbane, Dutton Park Gatton, Herston, St Lucia and other locations]]
Goerigk, L. [Auteur]
University of Melbourne
Ritchie, C. [Auteur]
Monash university

Titre de la revue :

J. Mater. Chem. C

Nom court de la revue :

J. Mater. Chem. C

Numéro :

12

Pagination :

-

Date de publication :

2024-12-21

ISSN :

2050-7526

Discipline(s) HAL :

Chimie/Chimie théorique et/ou physique

Résumé en anglais : [en]

A reversible change in a material's fluorescence spectrum on the application of force is known as mechanofluorochromism (MFC) and is a well-established field of study. However, the mechanism(s) responsible for the chromism ...
Lire la suite >A reversible change in a material's fluorescence spectrum on the application of force is known as mechanofluorochromism (MFC) and is a well-established field of study. However, the mechanism(s) responsible for the chromism may be different for each new material and it is important to elucidate these for many reasons, including the rational design of new analogues with targeted properties. Herein, the photophysical properties and mechanistic understanding of two MFC pyridinium betaines are reported. The emission sensitivity is explained by the coexistence of crystalline and amorphous phases after the application of mechanical force, with increased conformational flexibility in the amorphous phase facilitating red-shifts in emission. This explanation is supported by evidence from a range of spectroscopic techniques, including electron diffraction (ED) and fluorescence lifetime imaging microscopy (FLIM) mapping, two techniques that have, to the best of our knowledge, not been applied in the field of MFC to mechanically ground particles. For one of the compounds, ED on ground microcrystallites shows unambiguously that the same crystalline phase is retained after grinding, along with an amorphous contribution, providing direct evidence for the crystalline-amorphous mechanism, and the presence of these two phases is further supported by FLIM mapping. We envision these techniques will be highly instructive for the analysis of similar materials.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Équipe(s) de recherche :

Photodynamique, confinement, solvatation (PCS)

Date de dépôt :

2025-01-03T22:02:28Z
2025-01-15T08:26:07Z