Gilles Lemercier

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New, ultrasmall nanoparticles with sizes below 5 nm have been obtained. These small rigid platforms (SRP) are composed of a polysiloxane matrix with DOTAGA (1,4,7,10-tetraazacyclododecane-1-glutaric anhydride-4,7,10-triacetic acid)-Gd(3+) chelates on their surface. They have been synthesised by an original top-down process: 1) formation of a gadolinium(More)
The synthesis, optical properties and efficiency of new multifunctional nanoparticles as theranostic (fluorescence/MRI/PDT) agents are described. They are based on a polysiloxane network and surrounded by gadolinium(III) chelates and ruthenium(II) complexes. The size of the nanoparticles is maintained under 5 nm in order to permit their efficient(More)
The tremendous development of materials with fine tuning of their composition, shape, size and chemical functionalities at the nanometer scale has opened a wide range of applications, particularly in medicine. Metallic nanoparticles are extremely interesting for such developments. The fundamental study of surface plasmon resonance (SPR) versus the(More)
Two new fluorene derivatized 1,10-phenanthroline ligands and related tris-chelate Ru(II) or Zn(II) coordination complexes have been synthesised. The linear and nonlinear (two-photon induced fluorescence) photophysical measurements have contributed to highlight the possibility to tune the absorption spectral range and excited lifetime, depending on ligand(More)
The synthesis and characterization of [FeII(trim)2]Cl2 (2), [FeII(trim)2]Br2MeOH (3), and [FeII(trim)2]I2MeOH (4), including the X-ray crystal structure determinations of 2 (50 and 293 K) and 4 (293 K), have been performed and their properties have been examined. In agreement with the magnetic susceptibility results, the Mössbauer data show the presence of(More)
This short review provides a concise summary of the current state of research on the population by two-photon absorption of the triplet metal-to-ligand MLCT excited state of ruthenium(II) complexes. Several effective and potential applications of this nonlinear optics phenomenon (optical power limiting in the near infrared, biological imagery and(More)
The development of lasers has led to the design of optical limiters for the protection of optical sensors and human eyes against high-power pulsed lasers. These systems exhibit a high constant transmission at low incident fluences, while a large nonlinear extinction effect is induced by high incident fluences. Different processes can lead to nonlinear(More)
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(More)