Lanthanide Luminescence: Photophysical, Analytical and Biological Aspects
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- Lanthanide Luminescence: Photophysical, Analytical and Biological Aspects by Pekka Hänninen.
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The energy of the triplet level of the ligands was determined using the analogous Gd III complex and was found to be located at cm —1. This value is similar to the one reported in the literature 38 for the tta and bmdm ligands. This result confirms that both ligands tta and bmdm are suitable antennas for Eu III.
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That suggests the counterion, even outside the first coordination sphere, can disturb the symmetry around the Eu III in this series. However, the changes are smaller than the tta series. To gain more insight about the changes in the point symmetry, the JO intensity parameters 55 , 56 were obtained and are shown in Table 3. This result corroborates with the previous discussion about the emission spectra. Probably the bulky lateral groups of the bmdm ligand tert -butyl and methoxy insulate the Eu III from the influence of the counterion and have weak interactions with the alkyl chains of the counterion.
In this particular case the distance Eu—Eu may also be a factor in the deactivation; however, we were not able to quantify this effect. The theoretical JO intensity parameters Table 4 are in good agreement with the ones obtained experimentally Table 3. The calculated energy transfer from the triplet level of the ligand T to the 5 D 1,0 levels of the Eu III were obtained using the equations developed by Malta and co-workers 50 - 52 and are summarized in Table 5.
The energy transfer rates are influenced by the energy of the triplet level of the ligand and the distance donor-acceptor R L. We provided evidence based on the emission spectra and the calculation of the experimental JO intensity parameters Table 4 that the point symmetry around the Eu III can be disturbed by the interaction between the lateral groups of the ligands tta or bmdm and the counterion.
The theoretically calculated results are in excellent agreement with the experimental results, which demonstrates the effectiveness of the semi-empirical calculation in predicting the photophysical properties. The lifetime of the excited state 5 D 0 and quantum efficiency of the Eu III complexes are influenced by the different lengths of ammonium alkyl chains. This work is a result of the chemical design directed by theoretical calculations, used as a tool to predict and interpret photoluminescent properties. Here we evaluated by spectroscopic data and theoretical methods that will guide further development of new stable LB films applied as emissive layers in displays.
C , 3 , Colloid Interface Sci. Alloys Compd. Interface Sci. Theory Comput. Acta , 42 , Lanthanide-based near-infrared emitting metal—organic frameworks with tunable excitation wavelengths and high quantum yields.
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Chemical Communications , Royal Society of Chemistry, , 54 50 , pp. Exploring the ability of the nalidixate to sensitize visible and near-infrared emitting lanthanide III cations. Eliseeva, Tu N. Near-infrared luminescent metallacrowns for combined in vitro cell fixation and counter staining. Eliseeva, Stephane Petoud, et al.. Cooperative loading of multisite receptors with lanthanide containers: an approach for organized luminescent metallopolymers. Nguyen, Vincent L. Eliseeva, Patrick F. Martins, Alexander M. Chow, Svetlana V. Eliseeva, Evan R.
Trivedi, Jeff W. Kampf, et al.. Taking a last look at lanthanidomesogens? The use of basic thermodynamics for programming the temperature domains of existence of luminescent liquid crystals. Coordination Chemistry Reviews , Elsevier, , , pp. Trivedi, Tu N. Nguyen, Jeff W. Bonnet, Svetlana V. Eliseeva, Sara Lacerda, Thomas Chauvin, et al.. Eliseeva, Iurii P. Golovach, Valerii S. Liasotskyi, Valery P.
A role of copper II ions in the enhancement of visible and near-infrared lanthanide III luminescence. Journal of Luminescence , Elsevier, , , pp. Near-infrared emitting probes for biological imaging: Organic fluorophores, quantum dots, fluorescent proteins, lanthanide III complexes and nanomaterials. Transparent polycrystalline SrREGa 3 O 7 melilite ceramics: potential phosphors for tuneable solid state lighting.
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Trivedi, Svetlana V. Eliseeva, Joseph Jankolovits, Marilyn M.
Chemistry Analytical Chemistry. Springer Series on Fluorescence Free Preview. The first book to present application-oriented knowledge on this topic Written by experts Richly illustrated see more benefits. Buy eBook. Buy Hardcover. Buy Softcover.