Ionic liquids as solvents for near-infrared emitting lanthanide complexes
2004; Elsevier BV; Volume: 395; Issue: 4-6 Linguagem: Inglês
10.1016/j.cplett.2004.08.001
ISSN1873-4448
AutoresKris Driesen, Peter Nockemann, Koen Binnemans,
Tópico(s)Catalysis and Oxidation Reactions
ResumoIt is shown that ionic liquids are promising solvents for near-infrared emitting lanthanide complexes, because ionic liquids are polar non-coordinating solvents that can solubilize lanthanide complexes. Neodymium(III) tosylate, bromide, triflate and sulfonylimide complexes were dissolved in 1-alkyl-3-methylimidazolium ionic liquids that contain the same anion as the neodymium(III) complexes. Near-infrared luminescence spectra of these neodymium(III) salts were measured by direct excitation of the neodymium(III) ion. The absorption spectra show detailed crystal-field fine structure and Judd–Ofelt parameters have been determined. Intense near-infrared luminescence was observed upon ligand excitation for neodymium(III) complexes with 1,10-phenanthroline or β-diketonate ligands.
Referência(s)