Observation of a Less Stable Conformer of N,N′‐Piperazine‐bis(methylenephosphonate) Ligand in a Six‐coordinated Samarium Phosphonate Framework
Observation of a Less Stable Conformer of N,N′‐Piperazine‐bis(methylenephosphonate) Ligand in a Six‐coordinated Samarium Phosphonate Framework
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DOI：
10.1002/zaac.201400112
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发表时间：
2014-09
期刊：
影响因子：
--
通讯作者：
Xinfa Li
中科院分区：
文献类型：
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作者：
Xinfa Li
以N，N ′-哌嗪-双（亚甲基膦酸）盐酸盐和Sm 2 O3为原料，在谷氨酸存在下，通过水热反应合成了三维（3D）膦酸钐骨架化合物[Sm 2（H2 L）3]n·5 n（H2O）（1）[H4 L = N，N ′-哌嗪-双（亚甲基膦酸）]。单晶X-射线衍射分析表明，它具有三维开放的框架结构，螺旋通道沿着晶体学c轴。这些通道被离散的五聚体水分子团簇填充，这些水分子团簇通过氢键结合到主体上。化合物1显示出两个有趣的结构特征：（a）三个H2 L2-配体中的两个采用较不稳定的a，e-顺式构象;（B）两个SmIII离子都显示出相当不寻常的八面体配位排列。此外，还研究了其光致发光性能。
The three-dimensional (3D) samarium phosphonate framework [Sm2(H2L)3]n·5n(H2O) (1) [H4L = N,N′-piperazine-bis(methylenephosphonic acid)] was synthesized by hydrothermal reaction of Sm2O3 with N,N′-piperazine-bis(methylenephosphonic acid) hydrochloride in the presence of glutaric acid. Single-crystal X-ray diffraction analysis reveals that it has a 3D open framework structure with helical channels along the crystallographic c axis. The channels are filled up by discrete pentameric water clusters, which are hydrogen-bonded to the host. Compound 1 displays two interesting structural features: (a) two of three H2L2– ligands adopt the less stable a,e-cis conformation; (b) both of the SmIII ions exhibit rather unusual octahedral coordination arrangements. In addition, the photoluminescent property was investigated.