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采用水热法通过Gd2O3与乙二胺四乙酸为配体的反应合成出1个新的具有二维层状结构的钆金属配位聚合物{[Gd(HEDTA)].3H2O}n(1)。X-射线单晶衍射分析表明,晶体属于正交晶系,Pbca空间群,钆金属离子为八配位的方形反棱镜构型,通过乙二胺四乙酸配体处于相反位置上两个羧基的连接,形成了尺寸为0.6666 nm×0.6692 nm的四核钆金属方形构筑单元。这些构筑单元进一步被乙二胺四乙酸配体连接成(4,4)拓扑网络结构。游离水分子和羧酸氧原子间通过氢键作用进一步将二维结构构筑成ABAB顺序的三维超分子网络结构。磁性质测试表明该化合物为反铁磁。
A novel gadolinium metal coordination polymer {[Gd (HEDTA)] .3H2O} n (1) with two-dimensional layered structure was synthesized by hydrothermal method through the reaction of Gd2O3 and ethylenediaminetetraacetic acid . X-ray single crystal diffraction analysis showed that the crystal belongs to the orthorhombic system, the Pbca space group, the gadolinium metal ion is an octahedrally arranged square antiprism configuration, and the ethylenediaminetetraacetic acid ligand is in the opposite carboxyl group Connected to form a size of 0.6666 nm × 0.6692 nm quadrilateral gadolinium square metal construction unit. These building blocks are further connected to a (4,4) topological network structure by ethylenediaminetetraacetic acid ligands. The two-dimensional structure is further constructed into ABAB-ordered three-dimensional supramolecular network structure through the hydrogen bonding between the free water molecules and the carboxylic acid oxygen atoms. Magnetic properties show that the compound is antiferromagnetic.