Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 6, Pages 2474-2479Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405348
Keywords
charge transfer; chromophores; fluorescent probes; mechanical properties; solid-state structures
Categories
Funding
- National Basic Research Program of China [2011CBA00700]
- National Natural Science Foundation of China [51403060, 51203138, 51273179, 11204101, 21101137, 91227202]
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A donor-acceptor-type fluorophore containing a twisted diphenylacrylonitrile and triphenylamine has been developed by using the Suzuki reaction. The system indicates typical intramolecular charge-transfer properties. Upon mechanical grinding or hydrostatic pressure, the fluorophore reveals a multicolored fluorescence switching. Interestingly, a fluorescence color transition from green to red was clearly observed, and the change of photoluminescent (PL) wavelength gets close to 111nm. The mechanisms of high-contrast mechanochromic behavior are fully investigated by techniques including powder XRD, PL lifetime, high-pressure PL lifetime, and Raman spectra analysis. The tremendous PL wavelength shift is attributed to gradual transition of excited states from the local excited state to the charge-transfer state.
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