Journal Highlight: Multicolored-fluorescence switching of ICT-type organic solids with clear color difference: Mechanically controlled excited state

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  • Published: Feb 9, 2015
  • Author: spectroscopyNOW
  • Channels: UV/Vis Spectroscopy
thumbnail image: Journal Highlight: Multicolored-fluorescence switching of ICT-type organic solids with clear color difference: Mechanically controlled excited state
A newly developed donor–acceptor-type fluorophore containing a twisted diphenylacrylonitrile and triphenylamine fluorophore reveals multicolored fluorescence switching from green to red upon mechanical grinding or hydrostatic pressure.

Multicolored-fluorescence switching of ICT-type organic solids with clear color difference: Mechanically controlled excited state

Chemistry - A European Journal, 2015, 21, 2474-2479
Yujian Zhang, Kai Wang, Guilin Zhuang, Zengqi Xie, Cheng Zhang, Feng Cao, Guoxiang Pan, Haifeng Chen, Bo Zou and Yuguang Ma

Abstract: 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 111 nm. 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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