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Optical Properties of Lanthanide Squarates

100%
Huskowska E., Legendziewicz J., Drożdżewski P.
Acta Physica Polonica A
|
1996
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vol. 90
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issue 2
447-453
EN
Two types of lanthanide squarate hydrates of formulae Eu(C_{4}O_{4})(HC_{4}O_{4})(H_{2}O)_{6}·H_{2}O (compound I) and [Ln_{2}(C_{4}O_{4})_{3}(H_{2}O)_{8}] where Ln = Eu and Gd (compound II) were investigated. The optical properties of crystals I and selected spectral data of compound II are reported and confronted with earlier studies of europium complexes type II. Excitation and emission spectra were measured at 77 K. Effect of polymeric structure on spectroscopic properties is considered and correlated with the structural data. Cooperative intrachain interactions between metal ions coupled via squarate anions were pointed and cooperative absorption was recorded. To check the presence of the Eu^{2+} traces, the EPR and γ-irradiation measurements were applied. Raman spectra of the compound II (where Ln = from Sm to Lu) were measured in the range 50-500 cm^{-1}. Positions of the bands were considered in function of ionic radius of lanthanide ion. The above, together with the data from excitation spectra, allows to localize the Ln-O bands. Vibronic components in electronic spectra were elucidated and assigned.
2
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Vibronic Transitions in Centrosymmetric [Eu_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3} Crystals

88%
Stręk W., Legendziewicz J., Huskowska E., Lukowiak E., Hanuza J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 5
979-984
EN
The optical excitation and emission spectra of Eu(III) in [Eu_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3} centrosymmetric complex were measured. The vibronic transitions were observed in excitation and emission spectra. Following the vibrational analysis' of the infrared and Raman spectra of [Pr_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3}, the assignment of [Eu_{x}La_{1-x}(AP)_{6}](ClO_{4})_{3} vibronics was given The concentration effect on excitation and emission spectra was investigated. It was found that the vibronic intensities were changed upon the concentration effect. The intensive charge transfer bands were observed in blue region. Their intensities decreased with increasing concentration.
3
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Stereoselectivity Effect on Tb(III)-Eu(III) Energy Transfer in Complexes with Glutamic Acid and Alanine

88%
Legendziewicz J., Huskowska E., Stręk W., Łukowiak E., Sztucki J.
Acta Physica Polonica A
|
1993
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vol. 84
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issue 5
1021-1024
EN
The effect of stereoselectivity on energy transfer between Tb(III) and Eu(III) in crystals with glutamic acid and alanine was investigated. It was found that the stereoselectivity significantly changes the energy transfer in these systems. The theoretical model for the selective dependent energy transfer processes in lanthanide systems is developed and the nature of processes occurring in both systems under investigation briefly discussed.
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