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Inne
Structural and spectroscopy studies of complexes of the uranyl ion with 2,2'-bipyridine -N,N'-dioxide.
Autorzy
Rok wydania
2010
Czasopismo
Numer woluminu
29
Strony
2081-2086
DOI
10.1016/j.poly.2010.04.001
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
2,2′-Bipyridine-N,N′-dioxide (bypO2 = L) complexes of the composition [UO2(bypO2)2(NO3)2]·2H2O (UO2–L2–NO3), [UO2(bypO2)2H2O](ClO4)2 (UO2–L2–ClO4) and [UO2bypO2(H2O)2SO4] (UO2–L–SO4) have been prepared by the reactions of the respective hydrated uranyl salts with the bypO2 ligand in water. The structures of the complexes were elucidated using elemental and thermal analyses, IR and luminescence spectroscopy as well as luminescence lifetime measurements. The IR spectra show that the bonding between uranium and bypO2, as well as uranium and water or a counter ion (NO3− and SO42−) is formed. The nitrate or sulfate groups coordinate to the central metal ions in a monodentate manner. From TG–DTA curves, the nature of the water molecules present in the complexes and the decomposition temperature of the dehydrated uranyl complexes were determined. The thermal stability of the anhydrous uranyl complexes increases in the series: (UO2–L2–NO3) < (UO2–L2–ClO4) < (UO2–L–SO4). All the compounds show green-yellow intense luminescence. The main fluorescence bands and the emission lifetimes in these complexes were determined. The luminescence spectra of all the prepared complexes differ from each other with respect to their peak maxima positions. The luminescence lifetimes also vary. The structure of the (UO2–L–SO4) complex was determined by X-ray single-crystal analysis.
Słowa kluczowe
uranyl, molecule, 2′-Bipyridine-N, N′-dioxide, complexes, spectroscopy, structure
Adres publiczny
https://doi.org/10.1016/j.poly.2010.04.001
Strona internetowa wydawcy
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