Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 16, Pages 4758-4762Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b01923
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Funding
- European Research Council (ERC StG MECHANO-FLUO) [715757]
- CNRS (Mission pour l'Interdisciplinarite)
- IDEX Paris-Saclay
- Labex CHARMMMAT
- European Research Council (ERC) [715757] Funding Source: European Research Council (ERC)
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Mechanofluorochromic nanoparticles have been prepared from a difluoroboron beta-diketonate complex, and their behavior has been investigated at the nanoscale using atomic force microscopy (AFM) coupled with fluorescence spectroscopy. Two types of nanoparticles were observed, associated with green and yellow emission, reflecting the crystalline polymorphism of this material. While the green-emitting nanoparticles are mechanically insensitive under our conditions, the yellow-emitting ones display a marked hypsochromic shift upon shearing with the AFM tip. At the macroscopic level, the grinding of the bulk material is attributed to the amorphization of the crystalline powder. On the contrary, the marked mechanofluorochromism observed at the nanoscale is attributed to a crystal-to crystal phase transition. This specific behavior at the nanolevel is extremely promising for applications such as nanoprobes of local mechanical stress.
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