期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 17, 页码 9460-9469出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b00310
关键词
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资金
- DST, New Delhi, India (DST Fast Track Scheme) [SR/FT/CS-03/2011, SR/FST/ETI-284/2011]
- CRF facility
- SASTRA University
- MSIP
- POSTECH
A triphenylamine-based fluorophore, 4-((4-methoxyphenyl)(phenyl)amino)benzaldehyde (1), exhibits external-stimuli-responsive self-reversible solid-state fluorescence switching, tunable fluorescence, and a rare phenomenon of temperature-dependent fluorescence. Mechanically grinding a crystalline powder of 1 converts the blue fluorescence (lambda(max) = 457 nm) to green (lambda(max) (=) 502 nm), but blue fluorescence robustly self-recovers within 8 min. X-ray analysis and theoretical studies suggest that the change from a highly twisted molecular conformation and crystalline form into an amorphous phase with more planar conformation is responsible for the fluorescence switching. Self-reversible fluorescence switching did not show a significant change in fluorescence for several cycles of measurement. Interestingly, 1 in toluene showed a rare phenomenon of fluorescence enhancement with increasing temperature via activating more vibrational bands that lead to stronger twisted intramolecular charge-transfer (TICT) emissions. Morphological-change-mediated fluorescence tuning has also been demonstrated by fabricating nanoparticles of 1. The conversion of highly polydispersed, featureless, different-shaped nanoparticles into nearly uniformly sized spherical nanoparticles (2025 nm) converts green (lambda(max) = 502 nm) to blue fluorescence (lambda(max) = 478 nm). The self-reversible multi-stimuli-responsive fluorescence switching and polymorphism and nanofabrication-mediated fluorescence tuning suggest its potential application in sensors, particularly for fluorescent thermometers.
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