Jean-Claude Bunzli - Lanthanide(III) dendrimer complexes based on diphenylquinoxaline derivatives for photonic amplification

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  Eom,Y.K., Ryu,J.H., Bunzli,J.C.G., Baek,J.B., Kim,H.K.   Macromolecular Research 2013  21 (5) 556-564

  Abstract: A series of novel lanthanide(III)   complexes (Ln=Gd, Er, Yb) based on dendritic diphenylquinoxaline   (DPQ) ligands was designed and synthesized with the aim of   enhancing the luminescence intensity of Er3+ and Yb3+ ions for   photonic applications. The diphenyl-quinoxaline ligand was   introduced as a photon antenna for efficient light harvesting and   subsequent energy transfer onto the Ln(3+) ions. The dendritic   complexes showed strong near-IR emission at 981 (Yb3+) and 1,530   (Er3+) nm, which was sensitized through energy transfer from the   excited states of the diphenyl-quinoxaline ligands. The near-IR   emission intensity of the lanthanide ions in second-generation   [Ln(G2-DPQ-COO)(3)(terpy)] complexes was significantly enhanced,   due to the light-harvesting effect, with respect to   [Ln(G1-DPQ-COO)(3)(terpy)]. However, increasing the size of the   dendron in [Ln(G3-DPQ-COO)(3)(terpy)] was found to be detrimental   to the emission efficiency. This may be attributed to the twisted   structure of the dendritic ligand and suggests that   conformational effects should be taken into consideration when   designing ligands for photonic amplification

  Address (URL): WOS:000318177900013

 

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