Co(Ⅱ)-Zn(Ⅱ)掺杂配位聚合物的 合成及物理性能

采用均苯三甲酸配体、 硝酸锌与硝酸钴反应, 一步合成了钴掺杂的锌配位聚合物Zn_1-xCo_x(BTC)·(OH)(H₂O)₃(NMP)(DMF)(H₂O)_1.5(H₃BTC为1,3,5-均苯三酸, NMP为1-甲基-2-吡咯烷酮, DMF为N,N'-二甲基甲酰胺, x=0~0.8). 该化合物结构经X射线单晶衍射确定, 属于立方晶系, 空间群P2₁3, 晶胞参数a=1.43863(20) nm. 利用元素分析、 能量散色光谱(EDS)、 UV-Vis光谱、 X射线粉末衍射(XRD)、 热重分析(TGA)、 氮气吸附和磁性分析等表征手段对样品的物理性质进行了表征. 氮气吸附实验结果表明, 该配位聚合物具有良好的微孔吸附特性, Langmiur比面积为832 m ²/g, 孔径为0.84 nm; 元素分析结果表明, 钴/锌摩尔比为1∶1时, 在37~300 K温度范围内其磁性表现为反铁磁性, 并满足Curie-Weiss定律.

Synthesis and Physical Properties of Cobalt-Zinc Hybrid Porous Metal-organic Frameworks ?

Coordination polymer ZnCo(BTC)(OH)(H₂O)₃(NMP)(DMF)(H₂O)_1.5 was synthesized by slowly diffusing a balanced amount of organic amine into a solution of 1,3,5-benzenetricarboxylate(H₃BTC), zinc nitrate and cobalt nitrate. X-ray single crystal diffraction shows that the compound crystallizes in cubic, space group P2₁3, and its cell parameter is 1.43863(20) nm. Its physical properties were characterized by elemental analysis(EA), energy-dispersive X-ray spectroscopy(EDS), X-ray powder diffraction(XRD), N₂ sorption and variable-temperature magnetic susceptibility. The gas sorption shows this compound holds Ⅰ-isotherm characteristic of micropore, which is 0.84 nm of pore size and 832 m ²/g of langmiur surface area. The magnetic results show that it exhibits antiferromagnetism in the temperature range of 37—300 K.