Two highly photoluminescent Eu3+ β-diketonates complexes with ε-caprolactam as ancillary ligands: From synthesis to the first example as gunshot residue markers
This study reports the synthesis of two new Eu3+ β-diketonates and their complete experimental and theoretical spectroscopic characterizations. These compounds present [Eu(tta)3(ε-cap)(H2O)] 1 and [Eu(btfa)3(ε-cap)(H2O)] 2, supported by 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (Htta), 4,4,4-tri...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/248343 |
| Acceso en línea: | http://dx.doi.org/10.1016/j.optmat.2023.113527 http://hdl.handle.net/11449/248343 |
| Access Level: | acceso abierto |
| Palabra clave: | Diketonate complexes Gunshot residue Lanthanides Photophysical properties |
| Sumario: | This study reports the synthesis of two new Eu3+ β-diketonates and their complete experimental and theoretical spectroscopic characterizations. These compounds present [Eu(tta)3(ε-cap)(H2O)] 1 and [Eu(btfa)3(ε-cap)(H2O)] 2, supported by 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (Htta), 4,4,4-trifluoro-1-phenyl-1,3-butanedione (Hbtfa) formulas with a ε-caprolactam molecule acting as an ancillary ligand. These ligands act as efficient sensitizers for the Eu3+ ion, giving rise to an intense red emission. Due to this intense luminescence, compounds [Eu(tta)3(e-cap)(H2O)] 1 and [Eu(btfa)3(e-cap)(H2O)] 2 were selected as markers for the ammunition of a 38-caliber revolver and 0.380 pistol, respectively. This application is unprecedented for Eu3+ β-diketonates. The forensic assays indicated evident formation of luminescent gunshot residues (LGSR). Thus, these compounds may play an efficient role as allies in elucidating crimes. |
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