Near-infrared photoluminescence of lanthanide complexes containing the hemicyanine chromophore

R. Van Deun, Peter Nockemann, T.N. Parac-Vogt, K. Van Hecke, L. Van Meervelt, C. Gorller-Walrand, K. Binnemans

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The near-infrared luminescence properties of three (E)-N-hexadecyl-N',N'-dimethylamino-stilbazolium tetrakis(1-phenyl-3-methyl-4-benzoyl-5-pyrazolonato) lanthanide(III) complexes are described. These three complexes, containing trivalent neodymium, erbium and ytterbium, respectively, show near-infrared luminescence in acetonitrile solution upon UV irradiation. Luminescence decay times have been measured. The complexes consist of a positively charged hemicyanine chromophore with a long alkyl chain and a tetrakis(pyrazolonato) lanthanide(III) anion. Because of the absence of an alpha-hydrogen atom in the pyrazolonato ligands, and because of the saturation of the coordination sphere by four bidentate ligands, the luminescence properties are enhanced when compared to, e.g. quinolinate complexes. (C) 2007 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)5441-5447
Number of pages7
Issue number18
Publication statusPublished - 20 Nov 2007

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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