一种新型三维配位聚合物的合成以及表征和磁性测定(英文)

通过水热法合成了三维(3D)网状金属有机框架物[Pr(NTA)(H2O)]n(NTA=nitrilotriacetic acid);利用元素分析、红外光谱分析、X射线单晶衍射等表征了产物的结构,利用热重分析和示差热重分析评价了其热稳定性,并测定了其磁性能.结果表明,目标配合物的Pr(Ⅲ)采取九配位模式(N1O8)形成三帽三角棱柱几何构型,配位聚合物通过O-C-O链组装成高度有序的3D结构.此外,合成的配合物具有较高的热稳定性,并因(O2C-C-C-CO2)2桥联而显示反铁磁性.

Synthesis,characterization and magnetic properties of a novel three dimensional metal-organic framework

A novel three-dimensional （3D） metal-organic framework （MOF）, [-Pr （NTA） （H20）],, metal-organic coordination polymer, was synthesized under hydrothermal condition. As-synthesized MOF was characterized by means of elemental analysis, infrared spectrometry and single crystal X-ray diffraction. Moreover, the thermal stability of as-synthesized MOF was evaluated by thermogravimetric analysis and differential thermogravimetric analysis, and its magnetic properties were also evaluated. It has been found that Pr（ III ） adopts nine coordi- nated mode of N1O8 unit to construct a tricapped trigonal prism configuration, and the coordi nation polymer is further assembled into highly ordered 3D architecture through O--C--O link- ers. Besides, as-synthesized MOF is stable at high temperature, and it presents antiferromag- netic coupling through the （O2C--C--C--CO2）2 bridges.