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    Wyświetlanie 1-5 z 5
    Tytuł:
    Factors Affecting Luminescence Intensity of Lanthanide Ions. Analytical Applications of Lanthanide Luminescence in Solution
    Autorzy:
    Lis, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929808.pdf
    Data publikacji:
    1993-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 5; 1003-1010
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of N$\text{}_{3}^{-}$ Ions on Chemiluminescence of the Eu(II)/Eu(III)-H$\text{}_{2}$O$\text{}_{2}$ System
    Autorzy:
    Elbanowski, M.
    Staninski, K.
    Kaczmarek, M.
    Lis, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945476.pdf
    Data publikacji:
    1996-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.Ps
    78.55.-m
    Opis:
    The basic system of chemiluminescence investigations of relevant biological and inorganic compounds consists of Eu(II)/Eu(III) - H$\text{}_{2}$O$\text{}_{2}$. In these studies the increase in Eu(III) ion emission intensity usually results from an effective complexation reaction. In the present study, the N$\text{}_{3}^{-}$ 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 $\text{}^{5}$D$\text{}_{0}$ excited state of the Eu(III) ion are observed due to N$\text{}_{3}^{-}$ complexation. Taking into account the well-known Fenton system [Fe(II)/Fe(III) - H$\text{}_{2}$O$\text{}_{2}$], containing additionally the N$\text{}_{3}^{-}$, 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.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 1; 101-108
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies of Polyoxometalates and their Complexes with Lanthanide(III) Ions in Solution
    Autorzy:
    Lis, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945607.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.62.Hk
    78.40.-q
    78.40.Ha
    78.55.-m
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 275-283
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Characterization of Ethylenediamine-di(o-hydroxyphenyl)acetic Acid and its Complexes with Lanthanide(III) Ions
    Autorzy:
    Hnatejko, Z.
    Lis, S.
    Elbanowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945635.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.-m
    42.62.Hk
    78.40.Ha
    78.40.-q
    Opis:
    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$\text{}_{em}$=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).
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 353-359
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Spectroscopic Study of Europium(III) in Heteropolyanion [EuP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{12-}$
    Autorzy:
    Lis, S.
    Elbanowski, M.
    But, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945636.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Ha
    78.40.-q
    42.62.Hk
    78.55.-m
    Opis:
    The heteropolyanions of Preyssler anion [NaP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{14-}$ and its europium-encrypted derivative [EuP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{12-}$ 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.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 361-366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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