Energy transfer from Eu(III) and Tb(III) complexes to dyes in their mixed nanostructures. I

Dudar, S. S.; Свешникова, Е. Б.; Ермолаев, В. Л.

doi:10.1134/s0030400x08020136

Cited by 16 publications

(30 citation statements)

References 6 publications

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“…It was shown in 2008 [9,10] that the NPs consid ered in the previous section, which were formed in aqueous solutions of beta diketonate complexes of the Ln(III) ions, could capture the luminescent cationic dye molecules of the xanthene, oxazine, triphenyl methane, and polymethine series from the solution. The fluorescence sensitization of the captured dyes occurs by the light quanta (which are absorbed by the metal complexes) being incorporated into NPs; hence, a phenomenon is observed that could be called dye cofluorescence (similarly to Ln columinescence).…”

Section: Np Doped With Dye Moleculesmentioning

confidence: 98%

“…It was shown in [9,14] that, similarly to the I colum of the luminescent Ln(III) ions in NPs [15][16][17][18], the I cofl of the dyes in NPs depends on the point in time when the dye was introduced in the solution. The I cofl is larger if the dye molecules are introduced at the initial moment of NP formation and are found to be incorporated into NPs in comparison with the molecules adsorbed on the already formed NPs from complexes ( Table 1).…”

Section: Dyes Inside and On The Surface Of Npsmentioning

confidence: 99%

“…The I cofl is larger if the dye molecules are introduced at the initial moment of NP formation and are found to be incorporated into NPs in comparison with the molecules adsorbed on the already formed NPs from complexes ( Table 1). The cofluorescence intensity of all dyes in wateralcohol solutions depends on the time between the start of NP formation and the moment the dye is intro duced in the solution, as well as on the time between the start of NP formation with the dye and the moment of cofluorescence registration [9,11].…”

Section: Dyes Inside and On The Surface Of Npsmentioning

confidence: 99%

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Cofluorescence of dyes in nanoparticles formed from metal complexes and possibilities of its application

2012

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INRODUCTIONInterest in the use of nanotechnology is currently shifting to the areas of medicine and biochemistry; a search for methods to improve the sensitivity of lumi nescent analysis and widen the spectral range of lumi nescent labels by the production and use of new nano particles (NPs) is under way. One of the lines of inquiry is investigating the self formation of beta diketone complexes of lanthanide NPs, where the lumines cence sensitization of Eu(III), Sm(III), Tb(III), and other luminescent ions occurs through the energy absorption by the excess of the Gd(III), La(III), Lu(III), and other ion complexes that are not lumi nescent in these conditions. This phenomenon was discovered by Poluektov and coworkers in 1964 [1] and was used by them to increase the sensitivity of the luminescent detection of Eu and Sm. In 1987 these studies were taken up in China by the group of profes sor Yang (J. Yang) [2] and a year later by professor Y. X. Ci and coworkers [3]. The use of Triton X 100 neutral detergent for stabilizing the formed NPs in solution was a new aspect of their approach.The term cofluorescence effect was proposed by Ci [3] for the phenomenon under investigation, and in 1990 Yang and coworkers [4] proposed the term colu minescence to describe the same phenomenon. Both terms were actively used in the scientific literature. We believe that the term cofluorescence is not suitable for the system because in the case under consideration the luminescence of europium or other lanthanide ions is enhanced, which is not related to fluorescence according to the dominating terminology in scientific literature. We consider the term suggested by Yang (columinescence) more appropriate for this phenom enon [4]. The phenomenon of the columinescence of Ln(III) complexes was widely used starting from the 1990s in both luminescent analysis in rare earth metal chemistry and in immunoanalysis with an Ln label, in particular in time resolved analysis [5,6]. PREPARATION OF NPs FROM THE DIKETONATE OF TRIVALENT METALS: SIZE AND COMPOSITION OF NPsNP formation from metal ion complexes occurs in water from different beta diketones and synergistic agents. Diketones are poorly soluble in water, and some are insoluble. NPs are formed when the solution of the salts of trivalent metals is added to the aqueous solution of beta diketone and synergistic agent; with this it was shown that the best reproducibility took place when solutions of equal volumes with the dou bled concentration of beta diketone and the synergis tic agent were combined for NP preparation in com parison with the method when a small volume of a highly concentrated metal ion solution was added to the required diketone solution. The NP formation from complexes in aqueous solutions is a result of the higher hydrophobicity of the forming complexes in Abstract-A brief review on the regularities of nanoparticle (NP) formation in aqueous solution from Ln, Y, Al, Sc, and In diketonates, which capture fluorescent dye molecules upon formation, is presented. The inten sive sensi...

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Section: Np Doped With Dye Moleculesmentioning

confidence: 98%

Section: Dyes Inside and On The Surface Of Npsmentioning

confidence: 99%

Section: Dyes Inside and On The Surface Of Npsmentioning

confidence: 99%

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Cofluorescence of dyes in nanoparticles formed from metal complexes and possibilities of its application

2012

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“…It has been proposed to use fluorescence enhance ment of dye molecules and fluorescent polymers in nanoparticles consisting of other fluorescent polymers to create bright fluorescent labels for biology and med icine [2]. In a certain concentration range of metal ions (Ln(III), Al(III), Sc(III), and In(III)), β dike tones, and 1,10 phenanthroline (phen) in wateralcohol solutions, complexes of the said metals and nanoparticles consisting of these complexes are formed [3]. It was found that, during the formation, nanoparticles capture dye molecules from solution and sensitize their fluorescence [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…In a certain concentration range of metal ions (Ln(III), Al(III), Sc(III), and In(III)), β dike tones, and 1,10 phenanthroline (phen) in wateralcohol solutions, complexes of the said metals and nanoparticles consisting of these complexes are formed [3]. It was found that, during the formation, nanoparticles capture dye molecules from solution and sensitize their fluorescence [3,4]. Sensitizing effi ciency depends on the singlet exciton diffusion length over nanoparticles, which is determined by the life time of the singlet excited state of organic ligands in the complexes.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence enhancement of dyes embedded in nanoparticles of Lu, Eu, Al, and Sc diketonates of different composition and concentration

2014

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We have studied the effect of central ions (Lu(III), Eu(III), Sc(III), and Al(III)), organic ligands (2 naphthoyltrifluoroacetone (NTA) and p phenylbenzoyltrifluoroacetone (PhBTA)), and their concentra tion in a water-alcohol solution on the fluorescence of β diketonate complexes formed and nanoparticles (NPs) generated by the self assembly of these complexes. The fluorescence quenching of ligands of the com plexes of nanoparticles because of the introduction of molecules of dyes, such as Nile Blue (NB), Lissamine Rhodamine RB 200 (RB), and Crystal Violet (CV), in these nanoparticles is investigated, and the NP sen sitization of the fluorescence of these dyes is explored. The dependence of the intensity of the NP sensitized fluorescence of NB on its concentration in nanoparticles consisting of complexes that differ in composition and concentration is studied. By analyzing this dependence for the nanoparticles consisting of Sc(NTA) 3 , the size of the studied nanoparticles is evaluated. It is shown that the nature of this dependence is determined by a competition of two processes: the migration of the excitation energy over complexes to dyes and the migra tion of the excitation energy of dyes to impurities or dimer of dyes. The size of nanoparticles is compared to the estimated values of the exciton diffusion length and the critical radius of energy transfer from complexes to NB. An energy transfer of close to 100% from the nanoparticles formed of 10 μM of Sc(NTA) 3 to 50 nM of NB molecules embedded therein is observed. The introduction of NB molecules into nanoparticles leads to a 200 fold increase in fluorescence intensity compared to their direct excitation in solution.

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Delayed Fluorescence of Dyes Sensitized by Eu³⁺ Chelate Nanoparticles

et al. 2017

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Dye-doped nanoparticles of Eu 3+ chelate complexes with naphtoyltrifluoroacetone and 1,10-phenanthroline were synthesized using two different reprecipitation techniques. The nanoparticles were characterized by atomic force microscopy, absorption spectroscopy, steady-state, and timeresolved fluorescence spectroscopy. Fluorescent spectroscopy of chelate nanoparticles doped with Oxazine 170 and Nile blue dyes indicates that a single dye molecule efficiently quenches luminescence of more than a hundred chelates. The Eu 3+ chelates have a significantly longer luminescence lifetime than organic dyes, which leads to the appearance of delayed dyes fluorescence with microsecond lifetimes. The fluorescence brightness of dye-doped chelate nanoparticles was determined to be 50 times higher than that of a single Rhodamine 6G molecule. The combination of high fluorescence brightness and long fluorescence lifetime of the dye-doped chelate nanoparticles is promising for time-gated applications.

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Energy transfer from Eu(III) and Tb(III) complexes to dyes in their mixed nanostructures. I

Cited by 16 publications

References 6 publications

Cofluorescence of dyes in nanoparticles formed from metal complexes and possibilities of its application

Cofluorescence of dyes in nanoparticles formed from metal complexes and possibilities of its application

Fluorescence enhancement of dyes embedded in nanoparticles of Lu, Eu, Al, and Sc diketonates of different composition and concentration

Delayed Fluorescence of Dyes Sensitized by Eu³⁺ Chelate Nanoparticles

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Energy transfer from Eu(III) and Tb(III) complexes to dyes in their mixed nanostructures. I

Cited by 16 publications

References 6 publications

Cofluorescence of dyes in nanoparticles formed from metal complexes and possibilities of its application

Cofluorescence of dyes in nanoparticles formed from metal complexes and possibilities of its application

Fluorescence enhancement of dyes embedded in nanoparticles of Lu, Eu, Al, and Sc diketonates of different composition and concentration

Delayed Fluorescence of Dyes Sensitized by Eu3+ Chelate Nanoparticles

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Delayed Fluorescence of Dyes Sensitized by Eu³⁺ Chelate Nanoparticles