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Piezochromic Luminescence of Donor–Acceptor Cocrystals: Distinct Responses to Anisotropic Grinding and Isotropic Compression
Author(s) -
Liu Yingjie,
Zeng Qingxin,
Zou Bo,
Liu Yu,
Xu Bin,
Tian Wenjing
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201810149
Subject(s) - luminescence , grinding , materials science , cocrystal , anisotropy , chemical physics , isotropy , acceptor , stack (abstract data type) , compression (physics) , crystallography , optoelectronics , nanotechnology , chemistry , molecule , composite material , optics , hydrogen bond , condensed matter physics , organic chemistry , physics , computer science , programming language
Piezochromic luminescent materials that exhibit distinct luminescence responses to different types of mechanical stresses have been emerging as new kinds of materials which are rarely investigated. Herein, we report a donor–acceptor (D–A) charge‐transfer (CT) cocrystal, which shows distinct hypochromatic and bathochromatic shifts upon anisotropic grinding and isotropic compression, respectively. Detailed spectroscopic and structural analyses revealed that the hypochromatic shifted emission under grinding is attributable to a structural reorganization from a loosely segregated‐stack to a mixed‐stack, while the bathochromatic shifted emission originates from the formation of a tighter packing structure. We present rare evidence of a distinct luminescent response to anisotropic grinding and isotropic compression on the basis of structural rearrangement in a D–A cocrystal, and thus enriches our insight into piezochromic luminescence.