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Nouvelles architectures supramoléculaires à base de ligands phosphorés fluorescents : synthèse, études photophysiques et applications

Abstract : This work deals with the engineering of new fluorescent supramolecular systems containing phosphorus ligands in order to explore new optical materials and the detection of polluting heavy metals. Two new series of push-pull chromophores containing polyphenylethynyl units and an oxide or a sulfide of phosphane were successfully synthesized by using the Sonogashira coupling as a key reaction. These molecules showed a high fluorescence quantum yield as well as an effective character of charge transfer at the excited state. More interestingly, they exhibited good properties in two-photon absorption and nonlinear optics. Another class of bidentate ligands containing a phosphane oxide or a phosphane sulfide was also prepared for the detection of heavy metal ions. The phosphane oxide chelates strongly complexed lead and cadmium in CH3CN/CHCl3 mixture. These ligands offer a possibility of detection by using fluorescence induced by two-photon absorption. The phosphane sulfide chelates have excellent sensitivity and selectivity for mercury in a partially aqueous medium. Moreover, on the addition of the lanthanide ions, the fluorescence of the phosphane oxide chelates is quenched and a sensitized emission of the lanthanide ions was observed. The mechanism of the energy transfer from the ligands to the europium ion has been studied.
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https://tel.archives-ouvertes.fr/tel-00254039
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Submitted on : Wednesday, February 13, 2008 - 12:33:59 PM
Last modification on : Thursday, July 2, 2020 - 5:16:03 PM
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Minh-Huong Ha-Thi. Nouvelles architectures supramoléculaires à base de ligands phosphorés fluorescents : synthèse, études photophysiques et applications. Autre. École normale supérieure de Cachan - ENS Cachan, 2007. Français. ⟨tel-00254039⟩

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