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

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 luminesc...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2019-01, Vol.10 (3), p.843-847
Main Authors: Louis, Marine, Sethy, Ramarani, Kumar, Jatish, Katao, Shouhei, Guillot, Régis, Nakashima, Takuya, Allain, Clémence, Kawai, Tsuyoshi, Métivier, Rémi
Format: Article
Language:English
Subjects:
Anisotropy
Boron
Chemical Sciences
Circular polarization
Crystallography
Emitters
Excimers
Fluorescence
Luminescence
or physical chemistry
Organic chemistry
Shearing
Solid state
Theoretical and
X-ray diffraction
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Summary: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 | | values as high as 2.2-2.4 × 10 . A bathochromic shift in emission, together with a decrease of | | values to 3 × 10 , is induced upon application of a shearing stress. For the compound, interestingly, sign inversion of the anisotropy factor is observed under mechanical stimulation ("mechano-CPL effect"), which can be rationalized by a switching between monomer and excimer emission.
ISSN:2041-6520
2041-6539
DOI:10.1039/c8sc04026e