caa a22 4500 378897179 CHVBK 20180305123509.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1524/ract.92.12.903.55114 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.12.903.55114 Uranium(VI) complexes with sugar phosphates in aqueous solution [Elektronische Daten] [A. Koban, Gerhard Geipel, A. Roßberg, G. Bernhard] The complex formation in the aqueous systems of uranium(VI) with glucose 6-phosphate (G6P) and fructose 6-phosphate (F6P) were studied using potentiometric titration, TRLFS, and EXAFS. Two complexes with a uranyl-to-ligand ratio of 1:1 and 1:2 for both sugars were observed. Complex stability constants were determined by potentiometric titration for both complexes to be log β11(G6P)=5.89±0.40, log β12(G6P)=9.45±0.08, log β11(F6P)=5.72±0.21, and log β12(F6P)=9.54±0.09. Stability constants could be determined with TRLFS under the specific experimental conditions only for the 1:1 complexes: log β11(G6P)=6.35±0.28, and log β11(F6P)=5.66±0.17. The TRLFS measurements results show the UO2G6P complex to exhibit no fluorescence properties. For this system, only a decrease of the fluorescence intensity with increasing ligand concentration was observed. For the UO2F6P system, a red shift of the fluorescence emission bands of about 8 to 9nm compared to the free uranyl ion was observed. The fluorescence emission wavelengths of the UO2F6P complex were determined to be 483, 496, 518, 542, and 567nm, and the lifetime of this complex is 0.13±0.05μs. Uranium LIII-edge EXAFS measurements at pH 3.5, 4.0, and 5.5 yielded a shortened U-Oeq bond distance (2.30±0.02 to 2.37±0.02Å), compared to the UO22+(H2O)5 ion (2.40±0.02Å), due to a monodentate coordination via the oxygen atoms of the phosphate group. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Koban A. aut Geipel Gerhard aut Roßberg A. aut Bernhard G. aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/12/2004(2004-12-01), 903-908 0033-8230 92:12/2004<903 2004 92 ract https://doi.org/10.1524/ract.92.12.903.55114 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.12.903.55114 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Koban A. aut NATIONALLICENCE 700 1- Geipel Gerhard aut NATIONALLICENCE 700 1- Roßberg A. aut NATIONALLICENCE 700 1- Bernhard G. aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/12/2004(2004-12-01), 903-908 0033-8230 92:12/2004<903 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter