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首页> 外文期刊>Crystal growth & design >Synthesis, X-ray powder structure, and photophysical properties of three new Ce(III) sulfate-diaminotetraphosphonate-based coordination polymers
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Synthesis, X-ray powder structure, and photophysical properties of three new Ce(III) sulfate-diaminotetraphosphonate-based coordination polymers

机译：三种新型硫酸铈（III）-二氨基四膦酸酯基配位聚合物的合成，X射线粉末结构和光物理性质

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摘要

The hydrothermal reactions between Ce(SO_4)_2 and two diamino tetraphosphonic acids (H_8L~1 = 1,4-N,N,N′, N′-diaminobutyl tetraphosphonic acids and H_8L~2 = 1,4-N,N,N′,N′-diaminocyclohexyl tetraphosphonic acid) lead to the formation of three new mixed Ce(III) sulfate-tetraphosphonate polymeric frameworks of general formula [[Ce_2(H_2O) _x(H_4L~m)(HSO_4)_2] ·yH_2O]_n with x = 6, 2, 6, y = 4, 2, 0, and m = 1, 1, 2 for 1, 2, and 3, respectively. Two pseudopolymorphic structures, 1 and 2, are obtained by varying the synthetic conditions. The structures have been solved ab initio from laboratory X-ray powder diffraction data and refined using the Rietveld method. 1, 2, and 3 are 3D networks with different topology. In all the structures, the Ce metals are eight-coordinated from the oxygen atoms belonging either to water molecules, phosphonates, or sulphates groups. While the latter acts as bidentate ligands with the CeO_8 polyhedra, the coordination of the phosphonates groups differs in the structures. The cerium/phosphonate moieties form 1D columnar pillars, parallel to the a axis in 1, and corrugated 2D layers in 2 and 3. The sulfate groups connect the 1D and 2D objects to form the 3D network. The thermal behavior of the three compounds has been studied by coupling thermogravimetric and in situ diffractometric analyses. The three new materials are dual luminescent compounds, emitting in both the UV and visible regions, in two different time scales.
机译：Ce（SO_4）_2与两种二氨基四膦酸（H_8L〜1 = 1,4-N，N，N'，N'-二氨基丁基四膦酸和H_8L〜2 = 1,4-N，N，N ′，N′-二氨基环己基四膦酸）导致形成三个新的通式为[[Ce_2（H_2O）_x（H_4L〜m）（HSO_4）_2]·yH_2O] _n的混合硫酸铈（III）-四膦酸酯聚合物骨架其中x = 6，2，6，y = 4，2，0，m = 1，1，2分别代表1，2，3。通过改变合成条件可以获得两个假多晶型结构1和2。从实验室X射线粉末衍射数据开始就已经解决了结构问题，并使用Rietveld方法对其进行了改进。 1、2和3是具有不同拓扑的3D网络。在所有结构中，铈金属均与属于水分子，膦酸酯或硫酸酯基团的氧原子八配位。后者充当CeO-8多面体的双齿配体，但膦酸酯基团的配位在结构上有所不同。铈/膦酸酯部分形成平行于1的a轴的1D柱状柱，并形成2和3的波纹2D层。硫酸盐基团将1D和2D对象连接起来以形成3D网络。通过热重分析和原位衍射分析相结合，研究了这三种化合物的热行为。这三种新材料是双重发光化合物，可以在两个不同的时间范围内在紫外线和可见光区域发射。

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