• A modified cyclen azaxanthone ligand as a new fluorescent probe for Zn2+
    H. Nouri, C. Cadiou, L.M. Lawson Daku, A. Hauser, S. Chevreux, I. Dchamps-Olivier, F. Lachaud, R. Ternane, M. Trabelsi-Ayadi, F. Chuburu and G. Lemercier
    Dalton Transactions, 42 (2013), p12157-12164
    DOI:10.1039/c3dt51216a | unige:29225 | Abstract | Article PDF
A new cyclen derivative L, bearing a methyl-chromeno-pyridinylidene hydrazone moiety, was synthesized and studied in MeOH, as potential fluorescent “OFF-on-ON” sensors for Zn(II). Photocphysical properties of this ligand being PET regulated, L was only weakly emissive in the absence of metal ions (OFF). L fluorescence was increased modestly upon addition of one equivalent of Zn(II), and further increased upon addition of a second equivalent. Therefore, Zn:L behaved as a highly sensitive ON sensor for zinc. This efficiency was correlated to Zn(II) coordination via the hydrazone moiety of the fluorophore, producing an efficient CHelation-Enhanced Fluorescence (CHEF) effect. A complementary theoretical study carried out with DFT calculations further elucidated of the optical properties.
  • A novel ruthenium(ii) complex for two-photon absorption-based optical power limiting in the near-IR range
    M. Four, D. Riehl, O. Mongin, M. Blanchard-Desce, L.M. Lawson Daku, J. Moreau, J. Chauvin, J.A. Delaire and G. Lemercier
    Physical Chemistry Chemical Physics, 13 (38) (2011), p17304-17312
    DOI:10.1039/c1cp21661a | unige:17238 | Abstract | Article HTML | Article PDF
 
In this article, the synthesis of a novel high-conjugated ligand and its corresponding Ru(II) complex PTFTF:Ru is reported, along with the linear and nonlinear optical characterizations. Two-photon absorption based optical power limiting properties (OPL), especially in the near infrared, are described and compared to those of the analogous complexes previously published. Combined with a preliminary theoretical approach, this allows us to highlight several key parameters for OPL optimization in such molecular systems and more particularly the spectral overlap between TPA and excited-state absorption.
  
  • 3MLCT excited states in Ru(II) complexes: Reactivity and related two-photon absorption applications in the near-infrared spectral range
    G. Lemercier, A. Bonne, M. Four and L.M. Lawson Daku
    Comptes Rendus Chimie, 11 (6-7) (2008), p709-715
    DOI:10.1016/j.crci.2007.11.012 | unige:3561 | Article PDF
The synthesis and characterization of new 1,10-phenanthroline-based chromophores LT1, LT2 and LD1 featuring fluorene unit(s) are reported. Their absorption and emission as well as their two-photon absorption properties in the 450–650 nm spectral range are discussed in comparison with the parent 1,10-phenanthroline and already described ligands L1 and L2.

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