高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (3): 413.

• 研究论文 • 上一篇    下一篇

由柔性配体庚二酸组装的微孔稀土配位高聚物

黄亮1, 张利萍1, 金林培2   

  1. 1. 安阳师范学院化学系, 安阳 455000;
    2. 北京师范大学化学系, 北京 100875
  • 收稿日期:2003-06-12 出版日期:2004-03-24 发布日期:2004-03-24
  • 通讯作者: 黄 亮(1954年出生),男,副教授,从事配位化学研究.E-mail;lhuang@aytc.edu.cn E-mail:lhuang@aytc.edu.cn

Microporous Rare Earth Coordination Polymers Constructed by a Flexible Pimelic Acid Ligand

HUANG Liang1, ZHANG Li-Ping1, JIN Lin-Pei2   

  1. 1. Department of Chemistry, Anyang Teachers College, Anyang 455000, China;
    2. Department of Chemistry, Beijing Normal University, Beijing 100875, China
  • Received:2003-06-12 Online:2004-03-24 Published:2004-03-24

摘要: 合成了3种新的庚二酸(H2pim)稀土配位高聚物[Nd(Hpim)(pim)(H2O)]n·2nH2O(1),[RE2(pim)3(H2O)]n·nH2O[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.

关键词: 稀土元素, 柔性配体, 配位聚合物, 晶体结构

Abstract: Three new rare earth coordination polymers of pimelic acid (H2pim), [Nd(Hpim)(pim)(H2O)] ·2H2O(1) and [RE 2(pim)3(H2O)] ·H2O [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 form3D 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 H2pim are found, showing that coordinating characteristics of the flexible ligands are different from the rigid ligands.

Key words: Rare earth element, Flexible ligand, Coordination polymer, Crystal structure

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