- 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.
Dalton transactions (Cambridge, England : 2003) (2014-05-23)
Juliane Schott, Jerome Kretzschmar, Margret Acker, Sascha Eidner, Michael U Kumke, Björn Drobot, Astrid Barkleit, Steffen Taut, Vinzenz Brendler, Thorsten Stumpf
PMID24849080
ABSTRACT
In the presence of polyborates (detected by (11)B-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.
MATERIALS
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Product Description
Sigma-Aldrich
Sodium hydroxide, puriss., meets analytical specification of Ph. Eur., BP, NF, E524, 98-100.5%, pellets
Sigma-Aldrich
Sodium hydroxide, anhydrous, free-flowing, Redi-Dri™, reagent grade, ≥98%, pellets
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Sodium hydroxide, puriss. p.a., ACS reagent, reag. Ph. Eur., K ≤0.02%, ≥98%, pellets
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Boric acid, BioReagent, Molecular Biology, suitable for cell culture, suitable for plant cell culture, ≥99.5%