Síntese, caracterização e propriedades espectroscópicas de criptatos de lantanídeo do tipo [LnÌ(bipy)2py(CO2Et) 2(3+)] Synthesis, characterization and spectroscopic properties of [LnÌ(bipy)2py(CO2Et) 2]3+ lanthanide cryptates
| Autor: | Suzana P. Vila Nova, Giovannia A. de L. Pereira, Gilberto F. de Sá, Severino Alves Júnior, Hervé Bazin, Hervé Autiero, Gérard Mathis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Química Nova, Vol 27, Iss 5, Pp 709-714 (2004) |
| ISSN: | 1678-7064 0100-4042 |
| Popis: | This work reports on the synthesis, characterization (infrared and hidrogen nmr spectra) and photophysical properties (luminescence spectra and emission quantum yield) of the lanthanide cryptates [LnÌ(bipy)2py(CO2Et) 2]3+ with Ln = Eu3+, Tb3+ or Gd3+, which can be applied as efficient Light-Conversion-Molecular-Devices. From emission spectra of [EuÌ(bipy)2py(CO2Et) 2]3+ it was possible to assign C3 symmetry to the metal ion. The spectroscopic studies show a higher emission quantum yield (q=25%) for [TbÌ(bipy)2py(CO2Et) 2]3+ in aqueous solution, whereas the europium cryptate presents q=14%. This is justified by a more efficient energy transfer between triplet and emission levels of terbium (T->5D4). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|