Sagara Y, Takahashi K, Nakamura T, Tamaoki N. Mechanochromic Luminescence from Crystals Consisting of Intermolecular Hydrogen-Bonded Sheets.
Chem Asian J 2020;
15:478-482. [PMID:
31889429 DOI:
10.1002/asia.201901679]
[Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 12/29/2019] [Indexed: 12/23/2022]
Abstract
Introduction 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.
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