Rare-earth quinolinates: Infrared-emitting molecular materials with a rich structural chemistry

R. Van Deun, P. Fias, Peter Nockemann, A. Schepers, T.N. Parac-Vogt, K. Van Hecke, L. Van Meervelt, K. Binnemans

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122 Citations (Scopus)


Near-infrared-emitting rare-earth chelates based on 8-hydroxyquinoline have appeared frequently in recent literature, because they are promising candidates for active components in near-infrared-luminescent optical devices, such as optical amplifiers, organic light-emitting diodes, .... Unfortunately, the absence of a full structural investigation of these rare-earth quinolinates is hampering the further development of rare-earth quinolinate based materials, because the luminescence output cannot be related to the structural properties. After an elaborate structural elucidation of the rare-earth quinolinate chemistry we can conclude that basically three types of structures can be formed, depending on the reaction conditions: tris complexes, corresponding to a 1:3 metal-to-ligand ratio, tetrakis complexes, corresponding to a 1:4 metal-to-ligand ratio, and trimeric complexes, with a 3:8 metal-to-ligand ratio. The intensity of the emitted near-infrared luminescence of the erbium(Ill) complexes is highest for the tetrakis complexes of the dihalogenated 8-hydroxyquinolinates.
Original languageEnglish
Pages (from-to)8461-8469
Number of pages9
JournalInorganic Chemistry
Issue number26
Publication statusPublished - 27 Dec 2004

ASJC Scopus subject areas

  • Inorganic Chemistry


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