Optical Properties of Lanthanide Squarates

• Authors: E. Huskowska , J. Legendziewicz , P. Drożdżewski
• Languages of publication: EN

Abstracts

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.

Keywords

EN

78.20.Wc; 78.20.Dj

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1996
• Volume: 90
• Issue: 2
• Pages: 447-453

Dates

published

1996-08

Contributors

author

E. Huskowska

• Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland

author

J. Legendziewicz

• Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland

author

P. Drożdżewski

• Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Technical University of Wrocław, 23 Smoluchowskiego, 50-370 Wrocław, Poland

Identifiers

DOI

10.12693/APhysPolA.90.447