Jean-Claude Bunzli - Intense near-infrared luminescence of a mesomorphic ionic liquid doped with lanthanide beta-diketonate ternary complexes

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  Publication Details (including relevant citation   information):

  Puntus,L.N., Schenk,K.J., Bunzli,J.C.G. European Journal of   Inorganic Chemistry 2005 (23) 4739-4744

  Abstract: The ionic liquid   1-dodecyl-3-methylimidazole chloride ([C-12-mim]Cl) is doped with   1 mol-% of the lanthanide ternary complexes [Ln(tta)(3)(phen)]   (tta = thenoyltrifluoroacetonate, phen = 1,10-phenanthroline, Ln   = Nd, Eu, Er, Yb), resulting in luminescent mesogenic phases at   room temperature. According to DSC and SAXS measurements, the   temperature of the crystal -> liquid crystal transition is   below 10 degrees C. Analysis of vibrational and luminescence data   points to the inner co-ordination sphere of the Eu-III ion being   very similar in both the mesomorphic sample and the parent   beta-diketonate complex. The mesomorphic samples containing   Nd-III, Er-III, or Yb-III display relatively intense   near-infrared luminescence. This emission is enhanced in the   liquid crystalline phases with respect to the initial compounds,   as demonstrated for instance by the quantum yield of the   [Yb(tta)(3)(phen)]-containing mesogenic sample which amounts to   2.1 %, as compared to 1.6 and 1.1 % for the powdered ternary   complex and its solution in toluene, respectively. ((c) Wiley-VCH   Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

  Address (URL): J INORG CHEM