Schott Juliane, Kretzschmar Jerome, Acker Margret, Eidner Sascha, Kumke Michael U, Drobot Björn, Barkleit Astrid, Taut Steffen, Brendler Vinzenz, Stumpf Thorsten
Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, 01314 Dresden, Germany.
Dalton Trans. 2014 Aug 14;43(30):11516-28. doi: 10.1039/c4dt00843j. Epub 2014 May 22.
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.
在多硼酸盐存在的情况下（通过¹¹B-NMR检测），通过时间分辨激光诱导荧光光谱法（TRLFS）观察到形成了一种弱的铕（III）硼酸盐络合物（lgβ₁₁约为2，估计值）。这种络合物是形成固态铕（III）硼酸盐物种的前体。通过TRLFS研究了该固体在溶液中的形成与总硼浓度的关系：总硼浓度越低，固体形成越慢。通过红外光谱、粉末XRD和固态TRLFS对固态铕（III）硼酸盐进行了表征。铕与硼比例的测定预示着无定形固体中存在五硼酸盐单元。
