In this work, mesoporous materials based on inorganic/organic polyoxometalate (POMs) hybrids with the ability of further incorporating heterometallic lanthanum cations were designed. On the basis of the La³⁺ coordination to vacant organophosphonyle derivatives of POMs previously studied, herein POMs-grafted onto an amino-functionalized mesoporous SBA-15 ({NH₂}-SBA-15) with incorporated La³⁺ ions were synthesized by varying the amounts of the latter. L_III-edge La EXAFS spectroscopy of the resulting materials provided local structural information around La^III ions (i.e. number, nature and distances of neighboring atoms), which are comparable to that of the La^III complexes of POMs hybrids. This technique, in addition with ³¹P CP-MAS NMR spectroscopy, gave definitive clues for a selective uptake of the incorporated La³⁺ ions by the POMs grafted onto the {NH₂}-SBA-15 supports. This study is a clear demonstration that, due to their chelate effect, POMs hybrids act as efficient ligands for La³⁺ even in the presence of competitive adsorption sites. Consequently, a regular distribution of the La³⁺ ions along the channels of the SBA-15 is thus observed in these materials due to the nanostructuration of the POMs onto the support.

在这项工作中，设计了基于无机/有机多金属氧酸盐（POM）杂化物的介孔材料，该杂化物具有进一步掺入杂金属镧阳离子的能力。在先前研究的POM的空有机磷酰基衍生物的La ³⁺配位基础上，本文通过以下方法合成了接枝到具有La ³⁺离子的氨基官能化介孔SBA-15（{NH ₂ } -SBA-15）上的POM 。改变后者的数量。大号_III所得到的材料的拉_edge时EXAFS光谱的La提供局部结构信息^III离子（即数量，性质和相邻原子的距离），这是比得上La中的^IIIPOM杂种的复合物。除³¹ P CP-MAS NMR光谱分析外，该技术还为接枝到{NH ₂ } -SBA-15载体上的POM选择性吸收掺入的La ³⁺离子提供了明确的线索。这项研究清楚地表明，由于具有螯合作用，POM杂化物即使在存在竞争性吸附位点的情况下也可以作为La ^3+的有效配体。因此，由于POM在载体上的纳米结构，因此在这些材料中观察到了沿着SBA-15通道的La ³⁺离子的规则分布。