Piezochromic Luminescence of Donor–Acceptor Cocrystals: Distinct Responses to Anisotropic Grinding and Isotropic Compression. Issue 48 (8th November 2018)

• Record Type: Journal Article
• Authors: Liu, Yingjie; Zeng, Qingxin; Zou, Bo; Liu, Yu; Xu, Bin; Tian, Wenjing
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 48(2018)
• Page Start: 15670
• Page End: 15674
• Publication Date: 2018-11-08
• Subjects: anisotropic grinding -- donor–acceptor cocrystals -- isotropic compression -- molecular rearrangement -- piezochromic materials; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201810149
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : Under pressure : Distinct luminescent responses to anisotropic grinding and isotropic compression are found for a donor–acceptor cocrystal, called CT‐R. It shows a unique enhanced hypochromatic shift emission under grinding, but a remarkable bathochromic‐shift emission under hydrostatic pressure.