Anisotropic Poisson Effect and Deformation-Induced Fluorescence Change of Elastic 9,10-Dibromoanthracene Single Crystals

Shotaro Hayashi; Fumitaka Ishiwari; Takanori Fukushima; Shohei Mikage; Yutaka Imamura; Motomichi Tashiro; Michio Katouda

doi:10.1002/anie.202006474

Anisotropic Poisson Effect and Deformation-Induced Fluorescence Change of Elastic 9,10-Dibromoanthracene Single Crystals

Angew Chem Int Ed Engl. 2020 Sep 7;59(37):16195-16201. doi: 10.1002/anie.202006474. Epub 2020 Jul 14.

Authors

Shotaro Hayashi¹, Fumitaka Ishiwari^{2

3}, Takanori Fukushima³, Shohei Mikage⁴, Yutaka Imamura⁵, Motomichi Tashiro⁶, Michio Katouda^{7

8}

Affiliations

¹ Research Center for Molecular Design, School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi, 782-8502, Japan.
² Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan.
³ Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.
⁴ Department of Applied Chemistry, National Defense Academy, 1-10-20, Hashirimizu, Yokosuka, Kanagawa, 239-8686, Japan.
⁵ Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo, 192-0397, Japan.
⁶ Department of Applied Chemistry, Toyo University, Kujirai 2100, Kwagoe, Saitama, 350-8585, Japan.
⁷ Research Organization for Information Science and Technology, 1-18-16, Hamamatsucho Minato-ku, Tokyo, 105-0013, Japan.
⁸ Waseda Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.

PMID: 32488985
DOI: 10.1002/anie.202006474

Abstract

Elastic organic crystals have attracted considerable attention as next-generation flexible smart materials. However, the detailed information on both molecular packing change and macroscopic mechanical crystal deformations upon applied stress is still insufficient. Herein, we report that fluorescent single crystals of 9,10-dibromoanthracene are elastically bendable and stretchable, which allows a detailed investigation of the deformation behavior. We clearly observed a Poisson effect for the crystal, where the short axes (b and c-axes) of the crystal are contracted upon elongation along the long axis (a-axis). Moreover, we found that the Poisson's ratios along the b-axis and c-axis are largely different. Theoretical molecular simulation suggests that the tilting motion of the anthracene may be responsible for the large deformation along the c-axis. Spatially resolved photoluminescence (PL) measurement of the bent elastic crystals reveals that the PL spectra at the outer (elongated), central (neutral), and inner (contracted) sides are different from each other.

Keywords: DFT simulation; anisotropic Poisson effect; elastic organic crystals; fluorescence; molecular assembly.