Publicação
Dansyl-Thiourea Derivatives and BTI-Functionalized Silica-Coated Gold Nanostars: Development of Nanomaterials for catalysis and Fluorescent Ion Sensors
| Resumo: | The design of multifunctional materials capable of catalysis and selective sensing remains achallenge to the scientific community. This thesis aims to explore the development and characterization of multifunctional fluorescent materials, including gold nanostars coated with silica and a series of dansyl-thiourea derivatives. Gold nanostars with controlled silica thicknesses were synthesized and functionalized with a benzothioxanthene imide derivative, yielding hybrid nanomaterials with tuneable photophysical properties. The silica layer was found to directly influence fluorescence behaviour and catalytic performance. Three dansyl derivatives incorporating thiourea functionality, L1, L2, and L3, were synthesized and characterized. All compounds exhibited significant photophysical properties, including solvatochromism. L1 and L2 displayed strong and selective fluorescence quenching toward fluoride and cyanide ions, with L2 showing dual sensing ability in the solid state through both colourimetric and fluorimetric responses. The compounds also exhibited selective interactions with metal ions, particularly Cu(II) and Hg(II). For L1, a distinct fluorescence enhancement followed by quenching was observed, which was further supported by DFT calculations. Due to the strong chelating framework of L3, a Hg(II) complex was synthesized and fully characterized. Moreover, the three compounds were investigated about their thermostability, being confirmed their potential application as molecular thermometers. |
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| Autores principais: | Gomes, Inês Pereira |
| Assunto: | Gold nanostars Benzothioxanthene imide Dansyl fluorescence sensor |
| Ano: | 2026 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso embargado |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | The design of multifunctional materials capable of catalysis and selective sensing remains achallenge to the scientific community. This thesis aims to explore the development and characterization of multifunctional fluorescent materials, including gold nanostars coated with silica and a series of dansyl-thiourea derivatives. Gold nanostars with controlled silica thicknesses were synthesized and functionalized with a benzothioxanthene imide derivative, yielding hybrid nanomaterials with tuneable photophysical properties. The silica layer was found to directly influence fluorescence behaviour and catalytic performance. Three dansyl derivatives incorporating thiourea functionality, L1, L2, and L3, were synthesized and characterized. All compounds exhibited significant photophysical properties, including solvatochromism. L1 and L2 displayed strong and selective fluorescence quenching toward fluoride and cyanide ions, with L2 showing dual sensing ability in the solid state through both colourimetric and fluorimetric responses. The compounds also exhibited selective interactions with metal ions, particularly Cu(II) and Hg(II). For L1, a distinct fluorescence enhancement followed by quenching was observed, which was further supported by DFT calculations. Due to the strong chelating framework of L3, a Hg(II) complex was synthesized and fully characterized. Moreover, the three compounds were investigated about their thermostability, being confirmed their potential application as molecular thermometers. |
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