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Elastic Organic Crystals of a Fluorescent π‐Conjugated Molecule
Author(s) -
Hayashi Shotaro,
Koizumi Toshio
Publication year - 2016
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.201509319
Subject(s) - conjugated system , fluorescence , materials science , lamella (surface anatomy) , molecule , quantum yield , crystal (programming language) , bending , crystallography , relaxation (psychology) , stress relaxation , nanotechnology , photochemistry , polymer , composite material , chemistry , optics , organic chemistry , psychology , social psychology , physics , computer science , programming language , creep
An elastic organic crystal of a π‐conjugated molecule has been fabricated. A large fluorescent single crystal of 1,4‐bis[2‐(4‐methylthienyl)]‐2,3,5,6‐tetrafluorobenzene (over 1 cm long) exhibited a fibril lamella morphology based on slip‐stacked molecular wires, and it was found to be a remarkably elastic crystalline material. The straight crystal was capable of bending more than 180° under applied stress and then quickly reverted to its original shape upon relaxation. In addition, the fluorescence quantum yield of the crystal was about twice that of the compound in THF solution. Mechanical bending–relaxation resulted in reversible change of the morphology and fluorescence. This research offers a more general approach to flexible crystals as a promising new family of organic semiconducting materials.