Luminescence of Nile red as indicator of composition of nanoparticles from diketonate complexes of trivalent metals |
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Authors: | E B Sveshnikova S S Dudar’ V L Ermolaev |
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Institution: | 1.St. Petersburg State University of Information Technologies, Mechanics, and Optics,St. Petersburg,Russia |
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Abstract: | We study the sensitization of fluorescence of Nile red in nanoparticles formed in aqueous solutions of complexes of Al, In,
Sc, and Lu with DBM, DBM, and phen and of complexes of In with MBTA and phen. We show that, at concentrations of Nile red
of 2–50 nM and complexes of 10–30 μM, the fluorescence intensity of Nile red in aqueous solutions increases by 1.5–2 orders
of magnitude compared to its fluorescence in H2O. We find that, at these concentrations of Nile red in solutions of complexes Al, the dye is completely contained in nanoparticles
from these complexes. We show that Nile red molecules are inhomogeneously distributed in nanoparticles from complexes and,
upon the completion of the formation of nanoparticles, dye molecules tend to be localized in regions of nanoparticles formed
from diketonate complexes M(diketone)3phen (M is Lu or In) and Al(DBM)3. Upon the localization of Nile red in these regions, the maximum of its fluorescence spectrum shifts toward ∼600 nm and,
upon the penetration of Nile red into nanoparticles from Sc complexes, the shift of the maximum of its fluorescence spectrum
compared to the spectrum in water does not exceed 10 nm. The shifts of the spectra are collated with the ability of ions to
form diketonate and hydroxy diketonate complexes. We demonstrate that the fluorescence of Nile red is efficiently sensitized,
not only upon its penetration into nanoparticles formed from complexes, but also upon its adsorption on the nanoparticle surface
when Nile red molecules are introduced in solutions of already formed nanoparticles. |
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