TY  - JOUR
A1  - Kretzschmar, Jerome
A1  - Haubitz, Toni
A1  - Huebner, Rene
A1  - Weiss, Stephan
A1  - Husar, Richard
A1  - Brendler, Vinzenz
A1  - Stumpf, Thorsten
T1  - Network-like arrangement of mixed-valence uranium oxide nanoparticles after glutathione-induced reduction of uranium(VI)
JF  - Chemical communications
N2  - Glutathione (GSH), a ubiquitous intracellular reducing tripeptide, is able to reduce hexavalent uranium, U(VI), to its tetravalent form, U(IV), in aqueous media in vitro, inducing the formation of nanocrystalline mixed-valence uranium oxide particles. After the initial reduction to U(V) and subsequent dismutation, the yielded U(IV) rapidly hydrolyses under near-neutral conditions forming 2-5 nm sized nanoparticles. The latter further aggregate to 20-40 nm chain-like building blocks that finally arrange as network-like structures.
Y1  - 2018
U6  - https://doi.org/10.1039/c8cc02070a
SN  - 1359-7345
SN  - 1364-548X
VL  - 54
IS  - 63
SP  - 8697
EP  - 8700
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Haubitz, Toni
A1  - Tsushima, Satoru
A1  - Steudtner, Robin
A1  - Drobot, Björn
A1  - Geipel, Gerhard
A1  - Stumpf, Thorsten
A1  - Kumke, Michael Uwe
T1  - Ultrafast Transient Absorption Spectroscopy of UO(2)(2+)and [UO2Cl](+)
JF  - The journal of physical chemistry : A, Molecules, spectroscopy, kinetics, environment & general theory
N2  - For the only water coordinated "free" uranyl (VI) aquo ion in perchlorate solution we identified and assigned several different excited states and showed that the (3)Delta state is the luminescent triplet state from transient absorption spectroscopy. With additional data from other spectroscopic methods (TRLFS, UV/vis) we generated a detailed Jablonski diagram and determined rate constants for several state transitions, like the inner conversion rate constant from the (3)Phi state to the (3)Delta state transition to be 0.35 ps(-1). In contrast to luminescence measurements, it was possible to observe the highly quenched uranyl(VI) ion in highly concentrated chloride solution by TAS and we were able to propose a dynamic quenching mechanism, where chloride complexation is followed by the charge transfer from the excited state uranyl(VI) to chloride. This proposed quenching route is supported by TD-DFT calculations.
Y1  - 2018
U6  - https://doi.org/10.1021/acs.jpca.8b05567
SN  - 1089-5639
VL  - 122
IS  - 35
SP  - 6970
EP  - 6977
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Schott, Juliane
A1  - Kretzschmar, Jerome
A1  - Acker, Margret
A1  - Eidner, Sascha
A1  - Kumke, Michael Uwe
A1  - Drobot, Bjoern
A1  - Barkleit, Astrid
A1  - Taut, Steffen
A1  - Brendler, Vinzenz
A1  - Stumpf, Thorsten
T1  - Formation of a Eu(III) borate solid species from a weak Eu(III) borate complex in aqueous solution
JF  - Dalton transactions : a journal of inorganic chemistry, including bioinorganic, organometallic, and solid-state chemistry
N2  - In the presence of polyborates (detected by B-11-NMR) the formation of a weak Eu(III) borate complex (lg beta(11) similar to 2, estimated) was observed by time-resolved laser-induced fluorescence spectroscopy (TRLFS). This complex is a precursor for the formation of a solid Eu(III) borate species. The formation of this solid in solution was investigated by TRLFS as a function of the total boron concentration: the lower the total boron concentration, the slower is the solid formation. The solid Eu(III) borate was characterized by IR spectroscopy, powder XRD and solid-state TRLFS. The determination of the europium to boron ratio portends the existence of pentaborate units in the amorphous solid.
Y1  - 2014
U6  - https://doi.org/10.1039/c4dt00843j
SN  - 1477-9226
SN  - 1477-9234
VL  - 43
IS  - 30
SP  - 11516
EP  - 11528
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - Anklam, Elke
A1  - Behler, Jörg
A1  - Dingermann, Theodor
A1  - Elsinghorst, Paul
A1  - Fischer, Jochen
A1  - Esselen, Melanie
A1  - Foerster, Christian
A1  - Fröhlich, Daniel
A1  - Goedel, Werner Andreas
A1  - Gregory, Peter
A1  - Grimme, Stefan
A1  - Hackenberger, Christian
A1  - Hansmann, Max
A1  - Heppekausen, Johannes
A1  - Hasenstab-Riedel, Sebastian
A1  - Kirchhoff, Erhard
A1  - Kratz, Karl-Ludwig
A1  - Krausz, Ferenc
A1  - Linker, Torsten
A1  - List, Benjamin
A1  - Ray, Kallol
A1  - Salzer, Reiner
A1  - Schubert, Ulrich
A1  - Schueth, Ferdi
A1  - Schwarz, Helmut
A1  - Schwietzke, Uta
A1  - Strey, Reinhard
A1  - Stumpf, Thorsten
A1  - Vaagt, Franziska
A1  - Volodkin, Dmitry
A1  - Wilke, Guenther
A1  - Zass, Engelbert
A1  - Zemb, Thomas
T1  - Awards
JF  - Nachrichten aus der Chemie : Zeitschrift der Gesellschaft Deutscher Chemiker
Y1  - 2013
U6  - https://doi.org/10.1002/nadc.201390372
SN  - 1439-9598
SN  - 1868-0054
VL  - 61
IS  - 11
SP  - 1145
EP  - 1148
PB  - Ges. Dt. Chemiker
CY  - Frankfurt, Main
ER  -