Mechanofluorochromic properties of an AIEE-active 2-phenylbenzoxazole derivative: more than meets the eye? - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Mechanofluorochromic properties of an AIEE-active 2-phenylbenzoxazole derivative: more than meets the eye?

Mécanofluorochromisme d’un dérivé de 2-phénylbenzoxazole à propriétés AIEE: Au-delà des apparences?

Résumé

Stimuli-responsive organic materials that exhibit fluorescence emission changes upon mechanical stress inthe absence of any chemical reaction, i.e. mechanofluorochromic (MFC) materials, are in great demand for applications aspolymer stress sensors, security inks, data storage and memory devices[1,3].We looked for this property in the 2-phenylbenzoxazole (PBO) series, many derivatives of which are known for their excellent stability and unique emission properties in the solid state[4]. The presence of a dicyanovinyl group on the robust 2-PBO framework (Compound 1, Fig. 1) led to the emergence of aggregation-induced emission enhancement (AIEE) andMFCbehaviour. The pristine microcrystals emitted yellow-green light, which became golden yellow upon grinding, and vice versaby heating or solvent fuming. This phenomenon was accompanied by a reversible evolution of the photoluminescence quantum yields and lifetimes. These variations were attributed to the formation of different types of emissive species in the crystalline phases and in the ground, partly amorphous material. Evidence was also given for other spectroscopic effects, such as light reabsorption,which depend on the size, compactness and heterogeneity of the solid samples. Confusion between these effects and the genuine MFC effect could explain the apparent lack of repeatability and reproducibility that may be encountered in this delicate field of research[5]

Domaines

Chimie
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Dates et versions

hal-02890318 , version 1 (06-07-2020)

Identifiants

  • HAL Id : hal-02890318 , version 1

Citer

Chantal Carayon, Abdelhamid Ghodbane, Nadine Leygue, Ross Brown, Suzanne Fery-Forgues. Mechanofluorochromic properties of an AIEE-active 2-phenylbenzoxazole derivative: more than meets the eye?. Rencontres de Chimie Physique 2019, Oct 2019, Biarritz, France. ⟨hal-02890318⟩
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