Síntese, caracterização e propriedades espectroscópicas de criptatos de lantanídeo do tipo [LnÌ(bipy)2py(CO2Et) 2(3+)]

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 [Ln<FONT FACE=Symbol>Ì</FONT>(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 [Eu<FONT FACE=Symbol>Ì</FONT>(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 [Tb<FONT FACE=Symbol>Ì</FONT>(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).

Bibliographic Details

Main Authors:	Nova,Suzana P. Vila, Pereira,Giovannia A. de L., Sá,Gilberto F. de, Alves Júnior,Severino, Bazin,Hervé, Autiero,Hervé, Mathis,Gérard
Format:	Digital revista
Language:	Portuguese
Published:	Sociedade Brasileira de Química 2004
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000500006
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