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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

1996

vol. 90

issue 2

361-366

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.

EPR Study of Gadolinium(III) Complexes with Heteropolyanions: [Gd(SiW_{11}O_{39})_{2}]^{13-} and [GdP_{5}W_{30}O_{110}]^{12-}

76%

Szyczewski A., Lis S., Kruczyński Z., Pietrzak J., But S., Elbanowski M.

Acta Physica Polonica A

1996

vol. 90

issue 2

345-351

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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2 Acta Physica Polonica A

2 1996

2 But S.

2 Elbanowski M.

2 Lis S.

1 Kruczyński Z.

1 Pietrzak J.

1 Szyczewski A.

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

EPR Study of Gadolinium(III) Complexes with Heteropolyanions: [Gd(SiW_{11}O_{39})_{2}]^{13-} and [GdP_{5}W_{30}O_{110}]^{12-}