Jean-Claude Bunzli - Acridone-Benzimidazole Ring-Fused Ligands: A New Class of Sensitizers of Lanthanide Luminescence via Low-Energy Excitation

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  Publication Details (including relevant citation   information):

  Deiters,E., Gumy,F., Bunzli,J.C.C. European Journal of   Inorganic Chemistry 2010 (18) 2723-2734

  Abstract: Two monotopic tridentate ligands,   namely HL(AB1) and HL(AB2) have been synthesized which feature an   acridone chromophore fused on a benzimidazolepyridine framework.   They differ from each other by their connection points between a   N-methylacridone and a N-methylbenzimidazole chromophoric   moieties. Both ligands self-assemble with Ln(III) ions in neat   acetonitrile to form thermodynamically stable neutral complexes   of general formula [Ln(L(ABX))(3)] (log beta(13) in the range   22-25). Subsequent photophysical investigations conducted in the   same solvent demonstrate that ligand HL(AB1) sensitizes europium   luminescence (Q(Eu)(L) = 10% and tau(Eu) = 0.93 ms) whereas   ligand HL(AB2) sensitizes the luminescence of NIR-emitting   Ln(III) ions, in particular Yb(III) (Q(Yb)(L) = 0.86 % and   tau(Yb) = 29.3 mu s). The sensitization efficiencies eta(sens) of   both ligands have been determined for these two complexes and   found to be around 50-60%. The main advantage of these ligands is   their excitation wavelength which lies in the visible range   (410-430 nm)

  Address (URL): J INORG CHEM