草酸钕[Nd(H_(2)O)(C_(2)O_(4))_(2)](C_(6)N_(2)H_(16))_(0.5)·2H_(2)O的合成、结构及质子传导性质

Synthesis,Structure and Proton Conductivity Study of Neodymium Oxalate [Nd(H_(2)O)(C_(2)O_(4))_(2)](C_(6)N_(2)H_(16))_(0.5)·2H_(2)O

以N,N′-二甲基哌嗪为结构导向剂,在水热条件下合成了一个具有三维开放骨架结构的草酸钕[Nd(H_(2)O)(C_(2)O_(4))_(2)](C_(6)N_(2)H_(16))_(0.5)·2H_(2)O(化合物1)。单晶X-射线衍射测试结果表明,化合物1的结构由单帽四方反棱柱体NdO9和草酸单元相互连接构成;其结构中含有三维贯穿的12-元环孔道,其中水分子和质子化的Me_(2)ppz阳离子分别位于沿着b轴和a轴的孔道中。客体水分子的存在为质子导电性能提供了结构基础。水热及酸碱稳定性测试结果表明,化合物1的结构具有优异的稳定性。交流阻抗测试结果表明,化合物1具有高的质子传导率,在温度为348 K、相对湿度(RH)为98%的条件下,其质子传导率为2.81×10^(-4) S/cm。

Using N,N′-Dimethylpiperazine as structure directing agent,a 3D open-framework neodymium oxalate [Nd(H_(2)O)(C_(2)O_(4))_(2)](C_(6)N_(2)H_(16))_(0.5)·2H_(2)O(compound 1) was synthesized under hydrothermal condition.The single crystal X-ray diffraction reveals that the structure is composed of alternating single-capped tetragonal antiprism NdO_(9) and oxalic acid units connected to each other.The structure contains three-dimensional 12-membered ring channels,in which water molecules and protonated Me_(2)ppz cations are located in the channels along the b and a axes,respectively.The presence of guest water molecules provides the structural basis for proton conductivity.The results of hydrothermal and acid-base stability tests show that the structure of compound 1 had excellent stability.AC impedance tests show that compound 1 has a high proton conductivity,which is 2.81×10^(-4) S/cm at 348 K and 98% RH.