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Article Dans Une Revue Chemical Science Année : 2019

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

Résumé

Two difluoro-boron b-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 |g lum | values as high as 2.2-2.4 Â 10 À2. A bathochromic shift in emission, together with a decrease of |g lum | values to c.a. 3 Â 10 À3 , is induced upon application of a shearing stress. For the DFB-Hex-amide compound, interestingly, sign inversion of the anisotropy factor g lum is observed under mechanical stimulation ("mechano-CPL effect"), which can be rationalized by a switching between monomer and excimer emission.
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Dates et versions

hal-02276773 , version 1 (03-09-2019)

Identifiants

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Marine Louis, Ramarani Sethy, Jatish Kumar, Shouhei Katao, Régis Guillot, et al.. Mechano-responsive circularly polarized luminescence of organic solid-state chiral emitters. Chemical Science, 2019, 10 (3), pp.843-847. ⟨10.1039/c8sc04026e⟩. ⟨hal-02276773⟩
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