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  • Title: Fluorescent nanoparticles as selective Cu(II) sensors.
    Author: Méallet-Renault R, Hérault A, Vachon JJ, Pansu RB, Amigoni-Gerbier S, Larpent C.
    Journal: Photochem Photobiol Sci; 2006 Mar; 5(3):300-10. PubMed ID: 16520865.
    Abstract:
    Latex nanoparticles functionalized with cyclam (1,4,8,11-tetraazacyclotetradecane), a copper chelator, have been doped with a fluorescent dye (BODIPY derivative: 4,4-difluoro-8-(2',4',6'-trimethyl)phenyl-2,6-diethyl-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene). The bulky, hydrophobic fluorophore dissolves within the nanoparticles' polymer core up to a concentration of about 88.4 micromol g(-1). At this concentration the fluorescence yield is about 0.80. Adding Cu2+ ions to the solution decreases the fluorescence because of the energy transfer between the dye and the violet copper cyclam complexes. The response is fast: 90% of the quenching occurs within 1 s. The Cu2+ detection threshold is of 1 nanomolar. No interferences were observed with zinc and nickel ions.
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