2017年7月
Polymorphism, Mechanofluorochromism, and Photophysical Characterization of a Carbonyl Substituted Difluoroboron-beta-Diketone Derivative
JOURNAL OF PHYSICAL CHEMISTRY C
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- 巻
- 121
- 号
- 29
- 開始ページ
- 15897
- 終了ページ
- 15907
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.jpcc.7b01901
- 出版者・発行元
- AMER CHEMICAL SOC
Difluoroboron-beta-diketones are known to exhibit very promising mechanochromic luminescence but a greater understanding of these materials and their mechanoresponsive properties is still desirable. Here we demonstrate that a combination of spectroscopic and physicochemical techniques is necessary to understand the variation of solidstate fluorescence observed under mechanical stress and thermal annealing. For this study, we decided to focus on a new fluorescent compound showing a polymorphic behavior. Our investigation on the mechanofluorochromic properties is based on a thorough spectroscopic study (steady-state and time-resolved) on powder samples and thin films deposited on paper and coverglass substrates. Three different states were identified: two crystalline states (a stable green-emissive and a metastable yellow-emissive one) and an amorphous phase (yellow orange emission). The detailed photophysical properties highlight the dynamic excimer formation processes, which can take place in the yellow-emissive crystalline and amorphous states, along with the effect of the substrate on the thin films composition. These results were confirmed by studying the thermal annealing process with a combined AFM and fluorescence microscope. The switching between these states under mechanical and thermal treatments underlies the fluorescence color changes.
- リンク情報
- ID情報
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- DOI : 10.1021/acs.jpcc.7b01901
- ISSN : 1932-7447
- Web of Science ID : WOS:000406726200044