Synthesis of 2,6-bis-(oxazolyl)pyridine ligands for luminescent Ln(III) complexes

• Author(s): Pereira, Goreti ; Ferreira, Paula M. T. ; Castanheira, Elisabete M. S. ; Martins, José A. ; Ferreira, Miguel Filipe Moreira Marques
• Date: 2012
• Persistent ID: http://hdl.handle.net/1822/19944
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Dehydroaminobutyric acid; Dipicolinic acid; Bis-oxazoles; Ln(III) complexes; Luminescence
• Document Type: Article
• Language: English

Description

Submitted to the European Journal of Organic Chemistry New bis-(oxazolyl)pyridine ligands for Ln(III) ions were prepared using a expeditious methodology from threonine and dipicolinic acid chloride. The synthetic strategy includes a dehydration step to give a bis-dehydroaminobutyric acid derivative followed by bromination and cyclization with DBU. Photophysical studies of Eu(III) and Tb(III) complexes of these ligands showed that the 2,6-bis-(oxazolyl)pyridine moiety acts as an effective sensitizer for lanthanide luminescence and indicate the formation of 3:1 complexes [Ln-(bis-(oxazole)pyridine)3]3+.