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1
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Spectroscopic Studies of Polyoxometalates and their Complexes with Lanthanide(III) Ions in Solution

100%
Lis S.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 2
275-283
EN
The results of investigations related to physico-chemical properties, synthesis and structure of polyoxometalates and their lanthanide(III) complexes are briefly reviewed. Useful techniques for the verification of polyoxometalate compositions and the determination of components are compared. Complexation of metal ions, especially of lanthanide(III) ions, with polyoxometalates using absorption (in the UV-visible and the near IR region) and luminescence spectroscopy methods are presented. Absorption hypersensitive transitions of certain lanthanide(III) ions and laser-induced europium(III) ion luminescence spectroscopy are shown to be useful in complexation investigations. The significance of some polyoxometalate complexes as potential magnetic resonance imaging agents and in biological studies as antiviral agents are discussed.
2
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Factors Affecting Luminescence Intensity of Lanthanide Ions. Analytical Applications of Lanthanide Luminescence in Solution

100%
Lis S.
Acta Physica Polonica A
|
1993
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vol. 84
|
issue 5
1003-1010
EN
The factors which efficiently reduce nonradiative energy degradation of the lanthanide ion fluorescence are described. The most sensitive systems in spectrofluorimetric determination of trace amounts of lanthanide ions based on the complex formation, intramolecular energy transfer and mixed complexes with synergic agents in a liquid phase, are presented. Detection limits of highly sensitive systems obtained with the use of conventional and laser-excited spectrofluorimetry for Sm(III), Eu(III), Tb(III) and Dy(III) are compared.
3
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Synthesis and Spectroscopic Study of Europium(III) in Heteropolyanion [EuP_{5}W_{30}O_{110}]^{12-}

51%
Lis S., Elbanowski M., But S.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 2
361-366
EN
The heteropolyanions of Preyssler anion [NaP_{5}W_{30}O_{110}]^{14-} and its europium-encrypted derivative [EuP_{5}W_{30}O_{110}]^{12-} were prepared and spectroscopically characterized. The compositions of these heteropolyanions were verified based on the results from elemental and thermogravimetric analysis and the data of spectrophotometric determination of tungsten contents. Absorption in the UV-vis and IR region and luminescence spectra, as well as results of the laser-induced europium ion luminescence spectroscopy, obtained for solid complexes and their solutions, were analysed. Both in solid and solution the europium-encrypted derivative has three water molecules of hydration.
4
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Spectroscopic Characterization of Ethylenediamine-di(o-hydroxyphenyl)acetic Acid and its Complexes with Lanthanide(III) Ions

51%
Hnatejko Z., Lis S., Elbanowski M.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 2
353-359
EN
Binding properties of ethylenediaminedi(o-hydroxyphenyl)acetic acid (EHPG) with lanthanide(III) ions were studied using spectroscopic methods. Luminescence intensity and lifetime of the Tb(III) ion were measured in a wide pH range in order to characterize the Ln-EHPG complexation. The calculated hydration number of the Tb-EHPG system proved the replacement of six water molecules by the EHPG ligand in the inner coordination sphere of Tb(III). Energy transfer from Tb(III) to Eu(III) in the Tb(III)-EHPG-Eu(III) system indicated an existence of only monomeric form of the Tb-EHPG complex. Analysis of the ^1H NMR and FTIR spectra of the EHPG ligand and its complexes with lanthanide(III) ions confirmed the hexadentate manner of EHPG complexation with the lanthanides. The system of Dy(III)-EHPG, showing a linear dependence of luminescence intensity (λ_{em}=578 nm) of Dy(III) on its concentration, in the range of 3.3×10-7 to 1×10-5 mol. l-1, can be applied for spectrofluorimetric determination of Dy(III).
5
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Influence of N_{3}^{-} Ions on Chemiluminescence of the Eu(II)/Eu(III)-H_{2}O_{2} System

51%
Elbanowski M., Staninski K., Kaczmarek M., Lis S.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 1
101-108
EN
The basic system of chemiluminescence investigations of relevant biological and inorganic compounds consists of Eu(II)/Eu(III) - H_{2}O_{2}. In these studies the increase in Eu(III) ion emission intensity usually results from an effective complexation reaction. In the present study, the N_{3}¯ ions are used as a ligand. The increase in the chemiluminescence intensity of the Eu(III) ion, the pH influence (in the range of 4.5-7.5) on the chemiluminescence intensity of the Eu(III) ion, as well as the quenching of the ^{5}D_{0} excited state of the Eu(III) ion are observed due to N_{3}¯ complexation. Taking into account the well-known Fenton system [Fe(II)/Fe(III) - H_{2}O_{2}], containing additionally the N_{3}¯, Eu(III) or Sm(III) ions, we found that the Eu(III) or Sm(III) ions were excited as a result of energy transfer process. A mechanism of the studied reactions is proposed.
6
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EPR Study of Gadolinium(III) Complexes with Heteropolyanions: [Gd(SiW_{11}O_{39})_{2}]^{13-} and [GdP_{5}W_{30}O_{110}]^{12-}

39%
Szyczewski A., Lis S., Kruczyński Z., Pietrzak J., But S., Elbanowski M.
Acta Physica Polonica A
|
1996
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vol. 90
|
issue 2
345-351
EN
The gadolinium complexes: [Gd(SiW_{11}O_{39})_{2}]^{13-} [I] and [GdP_{5}W_{30}O_{110}]^{12-} (Gd-encrypted Preyssler anion) [II] have been chosen for EPR study. This study is a continuation of our recent investigation related to solid gadolinium complexes: β-diketonates and aminopolycarboxylates. The EPR spectra of the Gd-polyoxometalates studied provide much better resolution than those recently studied. The spectra of Gd-polyoxometalates containing 1.7 to 2.5% of Gd(III) do not require an additional computer processing for correct interpretation. It is on the contrary to the β-diketonates and polyaminocarboxylates (with the content of Gd(III) 22-33%) for which the use of the RKU computer program (based on Fourier transform) was necessary in order to enhance the spectra resolution thus improving their correct interpretation. The EPR spectra obtained for the compounds I and II markedly differ from the U-spectrum characteristic of Gd(III) in glasses. Taking into account the spin-Hamiltonian calculations the existence of Gd(III) ion in two different surroundings: in a strong crystal field of rhombic symmetry and in a weak crystal field, is observed. The differences observed between the case I and II seem to be related to a various hydration degree.
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