2,1,3-Benzothiadiazole-based bis-silylated compounds: Synthesis and use in the preparation of highly fluorescent low-contend organic–inorganic hybrid materials

Isoppo, Victória Goulart; Rodrigues, Marieli Oliveira; Rodembusch, Fabiano Severo; Moro, Angélica V.

doi:10.1016/j.jphotochem.2022.114277

Cited by 8 publications

(1 citation statement)

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“…The characterization of photoactive-doped materials heavily relies on the concentration of fluorophores, and various techniques can be employed to clarify binding, each operating at different sensitivities. However, the literature notes the intricacy of this characterization when a low content of fluorophores is utilized [60,61], which is precisely the situation with the modified starches prepared in this study. The morphology of the modified starches was first investigated using X-ray diffraction (XRD) (Figure 2).…”

Section: Characterizationmentioning

confidence: 84%

Solid-State Luminescence with a Large Stokes Shift in Starch Functionalized with Low-Content ESIPT Dye

Colonetti,

da Luz,

Rodembusch

2024

Colorants

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Herein, we present the preparation of solid-state photoactive starches with a large Stokes shift, along with the resulting materials. In this investigation, 2-(2′-hydroxyphenyl)benzazole derivatives responsive to intramolecular proton transfer in the excited state (ESIPT) were covalently bonded to the polymeric structure of starch through a reaction involving an isothiocyanate group and the hydroxyl groups of starch. These compounds exhibit absorption at approximately 350 nm, which is related to fully spin- and symmetry-allowed π → π* electronic transitions, and solid-state fluorescence at approximately 500 nm, which features a significant separation between the absorption and emission maxima (~9000 cm−1). Due to the minimal use of fluorophores in functionalized starch preparation, this modification does not affect the original properties of the starch. Finally, photoactive starch-based films with significantly high transparency were successfully produced.

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Section: Characterizationmentioning

confidence: 84%