Enhanced Fluorimetric Determination of Europium(III) With Thenoyltrifluoroacetone and 4,7-Diphenyl-1,10-Phenanthroline by Gadolinium(III)

Fluorescence enhancement of europium complex co-doped with terbium complex in a poly(methyl methacrylate) matrix

“…The non-fluorescent b-diketone complexes of yttrium, lanthanum, lutetium and gadolinium, and sometimes terbium, can donate energy that they have absorbed to the analogous fluorescent complexes of europium. Within the donating complex, the rareearth ion cannot accept energy from the level of the ligand, but the energy is transferred to the respective fluorescent complex, provided that the complexes are in close proximity, e.g., in an aqueous suspensions, co-precipitates, and LB films, containing a large excess of the donating complex [10][11][12]. This phenomenon was called co-fluorescence, or enhanced luminescence [13][14][15].…”

Fluorescence enhancement of samarium complex co-doped with terbium complex in a poly(methyl methacrylate) matrix

“…This type of fluorescence enhancement is actually an intrinsic fluorescence phenomenon referred to as the ''co-fluorescence'' effect [11][12][13]. The effect can be found in coprecipitates, chelate suspensions and Langmuir-Blodgett films [14][15][16].…”

Synergic Flotation Spectrophotometric Investigation of Rare Earth(III) Ions with Alizarin and 1,10-Phenanthroline

“…It was found that the synergic phenomenon occurs in the aqueous phase and provides a new possibility for improving the detection limit in the determination of RE(III) ions via the fluorescence enhancement of some RE(III) complexes with certain β-diketones using various types of nitrogen-involving neutral bidentate ligands, such as 1,10-phenanthroline (phen) and 2,2 -bipyridine (bpy). Moreover, the suspensions of this type of complex have been observed to form when RE(III) ions, phen, and certain β-diketones are mixed at higher micromolar concentrations (20,21). With regard to these investigations, it is anticipated after the synergic phenomenon occurs in the aqueous phase, separation of the mixed-ligand complexes can be carried out by the flotation process in a manner similar to the extraction process.…”