Formation of a Eu(III) borate solid species from a weak Eu(III) borate complex in aqueous solution
Formation of a Eu(III) borate solid species from a weak Eu(III) borate complex in aqueous solution
Schott, J.; Kretzschmar, J.; Acker, M.; Eidner, S.; Kumke, M. U.; Drobot, B.; Barkleit, A.; Taut, S.; Brendler, V.; Stumpf, T.
In the presence of polyborates (detected by 11B-NMR) a weak Eu(III) borate complex formation (lg beta ~ 2, estimated) was observed with time-resolved laser-induced fluorescence spectroscopy (TRLFS). This complex is a precursor for the formation of a solid Eu(III) borate species. The formation progress of this solid was investigated by TRLFS in dependence on 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, solid-state TRLFS. The determination of the europium to boron ratio portends the existence of pentaborate units in the amorphous solid.
Keywords: europium; borate; complexation; solid; TRLFS; NMR; IR; PARAFAC
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Dalton Transactions 43(2014)30, 11516-11528
DOI: 10.1039/C4DT00843J
Cited 44 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-20149