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Mechanochromic Luminescence from Crystals Consisting of Intermolecular Hydrogen‐Bonded Sheets
Author(s) -
Sagara Yoshimitsu,
Takahashi Kiyonori,
Nakamura Takayoshi,
Tamaoki Nobuyuki
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201901679
Subject(s) - luminescence , intermolecular force , hydrogen bond , photoluminescence , materials science , amorphous solid , photochemistry , infrared spectroscopy , derivative (finance) , anthracene , amide , crystallography , chemistry , molecule , optoelectronics , organic chemistry , financial economics , economics
of functional groups that can form intermolecular hydrogen bonds into highly‐emissive luminophores is a promising way to induce mechanochromic luminescence. Herein, we report that a 9,10‐bis(phenylethynyl)anthracene derivative featuring two amide groups forms green‐emissive crystals based on two‐dimensional hydrogen‐bonded molecular sheets. Mechanical grinding changed the emission from green to yellow, owing to a transition from a crystalline to an amorphous phase. Infrared spectroscopy revealed that mechanical stimuli disrupted the linear hydrogen‐bonding formation. A thermal treatment recovered the original green photoluminescence.