One new lanthanide coordination polymer, {[Gd (HEDTA)] ·3H2O}n (1), (H4EDTA =ethylenediaminete-traacetic acid) with 2D layer structure has been prepared by the hydrothermal synthesis and the structure and magnetic properties were characterized. Complex 1 crystallizes belong to orthorhombic system and has space group Pbca. The GdⅢ ion is eight-coordinated and located at a square-antiprismatic coordination geometry. The Gd(Ⅲ) ionsare arrayed by two opposite carboxylate groups of EDTA ligand bridges and form a tetranuclear homometallic Gd4(COO)4 square units with the dimensions of 0.666 6 nm× 0.669 2 nm. The square units are further assembled into a highly ordered (4, 4) net through the carboxylate bridges of EDTA ligands. Hydrogen bonds existes between interstitial water molecules and carboxyl oxygen atoms, as a result, the 2D network are further assembled into a 3D supramolecular network in the ABAB sequence. Magnetic studies indicated that complex 1 shows antiferromagnetic coupling between Gd(Ⅲ) ions.%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.
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