A carregar...
Publicação
Development of fluorochromic polymer doped materials as platforms for temperature sensing using three dansyl derivatives bearing a sulfur bridge
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 5.88 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Three novel bis-dansyl derivatives bearing a sulfur bridge have been synthesized, fully characterized, and their photophysical characterization studied in solution, as well as, in the solid state. All compounds exhibit fluorescence emission with quantum yields up to 60%, which vary significantly depending on the solvent used, and the inherent molecular structure. Moreover, these compounds demonstrate positive solvatofluorochromic behaviour emitting from bluish-green to yellow. Kamlet-Taft studies were performed to better understand the solute–solvent interactions. Due to the intrinsic characteristics of the compounds, efforts were made to understand their potential usefulness for environmental remediation and thus metal ion sensing studies were investigated. Compounds L1 and L2 showed high sensitivity to Cu2+ and Hg2+ ions and were found to modulate their emission extensively, with L2 capable of detecting and quantifying up to 4 µM of Hg2+. Considering the solid-state emission of these compounds, the application towards temperature sensing was put forth. L3 was found to quench its emission in a linear relation with temperature up to 170 °C. Several doped polymer thin films were fabricated, which served as a platform to establish a linear relation with temperature beyond their melting point. Polymethylmetacrylate (PMMA) films emitted up to temperatures of 218 °C, which could be fully restored at room temperature. These results suggest the potential application of these bis-chromophoric compounds as molecular thermometers.
Descrição
PM003/2016.
Funding Information:
G. D. thanks to the European Regional Development Fund within the Operational Programme Science and Education for Smart Growth 2014 - 2020 under the Project Center of Excellence: National center of mechatronics and clean technologies - BG05M2OP001-1.001-0008 for the financial support.
Publisher Copyright:
© 2023 The Author(s)
Palavras-chave
Dansyl derivatives Metal ions Polymers Sensors Solvatochromism Temperature General Chemistry General Chemical Engineering General Physics and Astronomy