一个中心对称的(6,3)拓扑二维蜂窝网的Ni-咪唑基三脚架配合物的合成、结构及其介电性

Synthesis,structures and dielectric properties of one centric (6,3) topological 2-D frameworks with Ni-Imidazole-containing tripodal ligand

  • 摘要: 利用水热合成法, 以金属盐NiSO4·6H2O与三脚架配体1, 3, 5-三(1-咪唑基)苯(tib)进行组装, 得到了一个结构新颖的有序金属-有机框架(MOFs) Ni3(tib)2(H2O)12(SO4)3n( 1 ).利用X-射线单晶衍射仪检测其晶体结构, 并进行元素分析, 红外光谱射线, 粉末衍射等相关表征.配合物 1 为一个典型的(6,3)拓扑二维蜂窝网结构,由于π-π空间叠加效应和氢键相互作用形成了稳定的三维结构.对配合物 1 介电性能进行测定, 发现其在138 ℃时达到最大的介电异常值10.08, 为典型的介电材料, 通过热重分析, 表明此材料具有较好的热力学稳定性, 对新型多维MOFs及新型介电性能材料的开发具有借鉴和指导意义.

     

    Abstract: The new novel metal-organic framework (M0Fs) Ni3(tib)2(H20)12(S04)3n(1) is obtained by hydrothermal reaction of the metal salt NiSO4·6H20 and the three-connecting ligand 1,3,5-tris(1-imidazolyl) benzene (tib). The crystal data and structure are established by single-crystal X-ray diffraction analysis, and characterized by elemental, IR, XRD, et al. and by using SHELXL-97 software for the structure elucidation and Topos40 software for its topology analysis. It shows that complex 1 is a 2D network honeycomb networks with (6,3) topology, which is further linked to three-dimensional (3D) frameworks by the spatial additive effect of π-π and interaction of hydrogen bonds. Dielectric constant studies show that the εmax of complex 1 reaches a value of about 10.08 at 138 ℃ ,which is the typical dielectric material. This material has good thermal stability indicated by thermogravimetric,which provides a reference and guidance for the development of the novel multidimensional M0FS and dielectric properties of new materials.

     

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