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Optical spectroscopy of europium nitrate with 2,2′-bipyridine Eu(NO3)3·Bpy3. One more of compounds with outer-sphere Bpy molecule? |
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| Authors: | V. Tsaryuk V. Zolin J. Legendziewicz R. Szostak P. Gawryszewska |
| Affiliation: | a Institute of Radioengineering and Electronics of RAS, 1 Vvedenskii Sq., 141190 Fryazino, Moscow Reg., Russia b Faculty of Chemistry, University of Wroclaw, 14 F. Joliot-Curie Str., 50-383, Wroclaw, Poland |
| Abstract: | The complex compound Eu(NO3)3·Bpy3 (Bpy, 2,2′-bipyridine) was synthesised and analysed by methods of optical spectroscopy. The spectra and details of the structure were discussed and compared with ones of well-known compounds Eu(NO3)3·Bpy2 and Eu(NO3)3·Phen2 (Phen, 1,10-phenanthroline). The water admixed to the ethanol as solvent promotes Bpy building into the outer sphere of complex [Eu(NO3)3·Bpy2]·Bpy. Both kinds of Bpy molecules in Eu(NO3)3·Bpy3 compound are nearer to coplanar, than Bpy in Eu(NO3)3·Bpy2. The bonds Eu–N are stronger and the bonds Eu–O are weaker in Eu(NO3)3·Bpy3 in comparison with the ones in Eu(NO3)3·Bpy2. The outer-sphere Bpy molecule, effecting as a “steric” factor, changes the nearest surroundings of Eu3+ ion in [Eu(NO3)3·Bpy2]·Bpy, making it similar to one of Eu(NO3)3·Phen2. |
| Keywords: | Europium nitrates Raman spectra IR spectra Luminescence spectra Luminescence excitation spectra |
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