title: Restorable piezochromism phenomenon in an AIE molecular crystal: combined synchronous Raman scattering.
abstract: Many AIE active molecules have been designed and synthesized, and have been found to possess many interesting characteristics. In recent years, research into AIE crystals has increased, and it has been clearly shown that the piezochromic effect of AIE crystals depends on their structure. While most of the related research has given qualitative results, to quantitatively reveal molecular conditions under different pressure conditions, crystals of an AIE material (2Z,2'Z)-3,3'-(1,4-phenylene)bis(2-(naphthalen-2-yl)acrylonitrile) were investigated by synchronous Raman scattering and fluorescence spectroscopies. The molecular structure of the crystal changed during the process of pressurizing and then depressurizing under hydrostatic pressure, and a 142 nm red-shift value was observed in the emission spectrum of the PBNA crystal. The crystal was transformed into a new phase when the pressure was above 1.03 GPa and returned to the original phase when the pressure was decreased. The unique restorable phase transformation process of the crystal of this AIE active material could be used for erasable optical information storage and stress sensing devices.
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China. ygma@scut.edu.cn.
authors.forename: Liqun
authors.initials: L
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China. ygma@scut.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Deng
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, P. R. China. wangy2011@jlu.edu.cn.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Jilin University, Changchun, 130012, P. R. China. wangy2011@jlu.edu.cn.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China. ygma@scut.edu.cn.
authors.forename: Yuguang
authors.initials: Y
authors.lastname: Ma