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Single crystals of praseodymium tribromide heptahydrate were grown from aqueous solution. The IR, Raman, and high resolution absorption spectra were measured at room and low temperatures. The assignments of IR and Raman frequencies are reported. The temperature dependence of intensities was found and vibronic coupling in f-f transitions was analysed. Anisotropy of the intensities of optical lines...
New complexes of lanthanides (Nd, Eu) with phosphoro-azo derivatives of β-diketones were synthesized. Optical properties of these compounds were investigated and confronted with the structure and single crystal spectra of different types of earlier reported lanthanide phosphoro-azo-β-diketonates. The exchange of the N-P-O-Me ligand group by the N-P-NR_{2} one plays only a minor role in binding character...
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