Journal article
Fluorescence modulation of pyridinium betaines: a mechanofluorochromic investigation
PW McDonald, J Xu, DR Lonsdale, I Jones, B Poggi, RP Cox, S Aloise, AD Scully, C Allain, L Bodelot, SA Moggach, TDM Bell, R Métivier, SGB Furness, L Goerigk, C Ritchie
Journal of Materials Chemistry C | ROYAL SOC CHEMISTRY | Published : 2024
DOI: 10.1039/d4tc04290e
Abstract
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 p..
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Awarded by Monash University
Funding Acknowledgements
Special thanks to Dr Deborah Barkauskas from the Garvan Institute of Medical Research for FLIM data acquisition and analysis, Dr Rosemary Young and Prof Kellie Tuck from Monash University, as well as BSc student Mr L. Tharaud who helped with spectral + microscopic measurements. Thanks also to Dr Pierre Le Magueres and Dr Lee M. Daniels from Rigaku Americas Corporation for acquisition and analysis of electron diffraction data. The Monash Chemistry team (Dr Alasdair McKay, Dr Boujemaa Moubaraki and Dr Craig Forsyth). P. W. M. thanks Monash University and the Australian Government for a Research Training Program Scholarship. The authors acknowledge the use of facilities within the Monash X-ray Platform. D. R. L. acknowledges an Australian Government Research Training Program Scholarship. L. G. is grateful for the generous allocations of computational resources from Research Platform Services (ResPlat) at The University of Melbourne (project punim0094). This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement no. 715757 MECHANOFLUO to C. A.). L. B. acknowledges that this research benefited, through the use of the PLATINE platform, from the support of the Ecole Polytechnique fundraising - Smart environments: Nanosensors and Nanoreliability Initiative. S. A. M. thanks the Australian Research Council (ARC) for a Future Fellowship (FT200100243). S. G. B. F. thanks the ARC for funding this research (FT180100543 and DP230102664). C. R. thanks Monash University and the ARC for funding this research (FT180100610 and DP230102664).