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Issue 3, 2019
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Mechano-responsive circularly polarized luminescence of organic solid-state chiral emitters

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Abstract

Two difluoro-boron β-diketonate complexes bearing chiral amido groups have been synthesized. Their mechano-responsive luminescence and chiroptical properties have been investigated in the solid state. Both compounds display a bright blue-green emission and a significant circularly polarized luminescence (CPL) signal in the crystalline state, with |glum| values as high as 2.2–2.4 × 10−2. A bathochromic shift in emission, together with a decrease of |glum| values to c.a. 3 × 10−3, is induced upon application of a shearing stress. For the DFB-Hex-amide compound, interestingly, sign inversion of the anisotropy factor glum is observed under mechanical stimulation (“mechano-CPL effect”), which can be rationalized by a switching between monomer and excimer emission.

Graphical abstract: Mechano-responsive circularly polarized luminescence of organic solid-state chiral emitters

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Supplementary files

Article information


Submitted
10 Sep 2018
Accepted
26 Oct 2018
First published
29 Oct 2018

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2019,10, 843-847
Article type
Edge Article

Mechano-responsive circularly polarized luminescence of organic solid-state chiral emitters

M. Louis, R. Sethy, J. Kumar, S. Katao, R. Guillot, T. Nakashima, C. Allain, T. Kawai and R. Métivier, Chem. Sci., 2019, 10, 843
DOI: 10.1039/C8SC04026E

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