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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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Publication details

The article was received on 10 Sep 2018, accepted on 26 Oct 2018 and first published on 29 Oct 2018


Article type: Edge Article
DOI: 10.1039/C8SC04026E
Citation: Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    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, Advance Article , DOI: 10.1039/C8SC04026E

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