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1

Synthesis and Spectroscopic Study of Europium(III) in Heteropolyanion [EuP_{5}W_{30}O_{110}]^{12-}

100%

Lis S., Elbanowski M., But S.

Acta Physica Polonica A

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1996

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vol. 90

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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.

2

Spectroscopic Characterization of Ethylenediamine-di(o-hydroxyphenyl)acetic Acid and its Complexes with Lanthanide(III) Ions

100%

Hnatejko Z., Lis S., Elbanowski M.

Acta Physica Polonica A

|

1996

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vol. 90

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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).

3

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

100%

Lis S.

Acta Physica Polonica A

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1996

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vol. 90

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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.

4

Ultrahigh Frequency Components in the Hot Electron Photomagnetoelectric Response of Strongly Photoexcited Narrow-Gap Semiconductors

100%

Shatkovskis E., Galickas A., Kiprijanovič O.

Acta Physica Polonica A

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2005

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vol. 107

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issue 2

271-274

EN

A photomagnetoelectric effect has been investigated in semiconductors InAs and Cd_xHg_{1-x}Te (x=0.2 and 0.26) excited by Q-switched neodymium-YAG laser. The photomagnetoelectric signal undergos double-sign-inversion when the intensity of the exciting light pulses exceeds a critical value I_c=5×10^{24} photons/(cm^2 s) for InAs and (1-4)×10^{24} photons/(cm^2 s) for Cd_xHg_{1-x}Te samples. It is shown that a frequency spectrum of photomagnetoelectric response is broadened significantly in the region of high frequencies. In general three frequency bands were distinguished. From this investigation it follows that using laser pulses of a duration t_{opt} 1-10 ps the photomagnetoelectric signal in the terahertz range may be generated.

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4 Acta Physica Polonica A

1 2005

3 1996

3 Lis S.

2 Elbanowski M.

1 But S.

1 Galickas A.

1 Hnatejko Z.

1 Kiprijanovič O.

1 Shatkovskis E.

Synthesis and Spectroscopic Study of Europium(III) in Heteropolyanion [EuP_{5}W_{30}O_{110}]^{12-}

Spectroscopic Characterization of Ethylenediamine-di(o-hydroxyphenyl)acetic Acid and its Complexes with Lanthanide(III) Ions

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

Ultrahigh Frequency Components in the Hot Electron Photomagnetoelectric Response of Strongly Photoexcited Narrow-Gap Semiconductors