Spectral and Luminescent Properties of Coumarins
in Nanoparticles from Metal Ion Complexes

L. Yu. Mironov, E. B. Sveshnikova, and V. L. Ermolaev

St. Petersburg National Research University of Information Technologies, Mechanics,
and Optics, St. Petersburg, 199034 Russia

e-mail: ermolaev@oi.ifmo.ru

Received December 26, 2012

Abstract—We have studied the absorption spectra of complexes of trivalent ions Y, La, Lu, and Sc with p-phe-
nylbenzoyltrifluoroacetone that were introduced into a solution of 90% H₂O + 10% iso-C₃H₇OH in the absence
and presence of either 1,10-phenanthroline or coumarins 6, 7, or 30. We have shown that these coumarins, as
well as phenanthroline, are synergistic bidentate ligands that are incorporated into complexes up to concentra-
tions comparable with concentrations of complexes and that stabilize them in the solution. We have studied the
dependences of the fluorescence (cofluorescence) intensity (I_cofl) of the coumarins on their concentration in
nanoparticles from the complexes mentioned above. We have shown that, in nanoparticles from complexes of
Y(III), Ln(III), and Sc(III), I_cofl of coumarin 30 at high concentrations is higher than I_cofl of coumarins 6 and 7.
In addition, up to concentrations of coumarin 30 comparable with the concentration of complexes in nanopar-
ticles, there is no concentration quenching of its fluorescence. For coumarins 6 and 7, which are prone to asso-
ciation in the solution under study, the process of incorporating coumarins into complexes competes with their
association, which leads to concentration quenching and changes in the shape of their cofluorescence spectra.

DOI: 10.1134/S0030400X13070114

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