@misc{SchottKretzschmarAckeretal.2014, author = {Schott, Juliane and Kretzschmar, Jerome and Acker, Margret and Eidner, Sascha and Kumke, Michael Uwe and Drobot, Bj{\"o}rn and Barkleit, Astrid and Taut, Steffen and Brendler, Vinzenz and Stumpf, Thorsten}, title = {Formation of a Eu(III) borate solid species from a weak Eu(III) borate complex in aqueous solution}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-98774}, pages = {13}, year = {2014}, abstract = {In the presence of polyborates (detected by 11B-NMR) the formation of a weak Eu(III) borate complex (lg β11 ∼ 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.}, language = {en} } @article{SchottKretzschmarAckeretal.2014, author = {Schott, Juliane and Kretzschmar, Jerome and Acker, Margret and Eidner, Sascha and Kumke, Michael Uwe and Drobot, Bjoern and Barkleit, Astrid and Taut, Steffen and Brendler, Vinzenz and Stumpf, Thorsten}, title = {Formation of a Eu(III) borate solid species from a weak Eu(III) borate complex in aqueous solution}, series = {Dalton transactions : a journal of inorganic chemistry, including bioinorganic, organometallic, and solid-state chemistry}, volume = {43}, journal = {Dalton transactions : a journal of inorganic chemistry, including bioinorganic, organometallic, and solid-state chemistry}, number = {30}, publisher = {Royal Society of Chemistry}, address = {Cambridge}, issn = {1477-9226}, doi = {10.1039/c4dt00843j}, pages = {11516 -- 11528}, year = {2014}, abstract = {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.}, language = {en} } @article{KretzschmarHaubitzHuebneretal.2018, author = {Kretzschmar, Jerome and Haubitz, Toni and Huebner, Rene and Weiss, Stephan and Husar, Richard and Brendler, Vinzenz and Stumpf, Thorsten}, title = {Network-like arrangement of mixed-valence uranium oxide nanoparticles after glutathione-induced reduction of uranium(VI)}, series = {Chemical communications}, volume = {54}, journal = {Chemical communications}, number = {63}, publisher = {Royal Society of Chemistry}, address = {Cambridge}, issn = {1359-7345}, doi = {10.1039/c8cc02070a}, pages = {8697 -- 8700}, year = {2018}, abstract = {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.}, language = {en} }