【摘要】 合成了 3种新的庚二酸 ( H2 pim )稀土配位高聚物 [Nd( Hpim) ( pim) ( H2 O) ]n · 2 n H2 O ( 1 ) ,[RE2 ( pim) 3( H2 O) ]n· n H2 O[RE=Er( 2 ) ,RE=Ho( 3 ) ],并通过元素分析红外光谱和单晶 X射线衍射技术确定了其组成和晶体结构 .配合物 1为具有微孔的三维网状结构 .配合物 2和 3同构 ,通过两种类型的O— H… O氢键将由配位键构筑的二维骨架结构组装成三维超分子结构 .在这 3个配合物中 ,庚二酸配体在同一配合物的结构中均存在不同的构象 ,体现了柔性配体不同于刚性配体的配位特点更多还原

【Abstract】 Three new rare earth coordination polymers of pimelic acid (H 2pim), [Nd(Hpim)(pim)(H 2O)] ·2H 2O(1) and [RE 2(pim) 3(H 2O)] ·H 2O [RE=Er(2), RE=Ho(3)] , were synthesized and characterized by elemental analyses, IR spectra and X ray crystallography. In complex 1, Nd(Ⅲ) is bridged by pimelic acid ligands to form 3D microporous structure. There are two types of lattice water in complex 1. One lies in microporous structure and the other is used to form O—H…O hydrogen bond. In complex 2, Er(Ⅲ) ions are connected by pimelate ligands into a 2D microporous layer structure. Two types of O—H…O hydrogen bonds make 2D framework into 3D supramolecular structure. Single crystal X ray diffraction analyses shows that complex 3 is isostructural to complex 2. In three complexes, different conformations for H 2pim are found, showing that coordinating characteristics of the flexible ligands are different from the rigid ligands.更多还原