中文摘要：

水热法合成了配合物{[Ln（Hbmdc）（bmdc）（H2O）3]·3H2O}n（Ln=Eu,1;Dy,2;H2bmdc=苯并咪唑-5,6-二羧酸）,用X-射线单晶衍射分析确定了配合物的晶体结构。配合物为单斜晶系,P21/c空间群。配合物1和2具有相似的一维链状结构。配体H2bmdc以2种不同的类型与Ln^3＋离子配位：完全去质子化的bmdc配体和咪唑环上的氮原子被质子化的Hbmdc配体。bmdc配体的2个羧基采取双齿螯合/双齿螯合方式配位;Hbmdc配体的1个羧基采取双齿螯合方式配位,另1个羧基未参与配位。每个Ln^3＋离子与6个羧基氧原子和3个水分子中氧原子配位,形成9配位的扭曲单帽四方反棱柱体。相邻的Ln^3＋离子通过bmdc配体桥联形成螺旋链状结构。链和链之间通过π-π堆积和氢键进一步连接成三维超分子结构。配合物1和2分别显示Eu3＋和Dy3＋离子的特征荧光。

英文摘要：

The complexes {[Ln（Hbidc）（bidc）（H2O）3]·3H2O}n （Ln=Eu 1, Dy 2; H2bidc=benzimidazole-5,6-dicarboxylic acid）have been obtained by hydrothermal method and characterized by X-ray single-crystal diffraction. The two complexes belong to monoclinic system, P21/c space group. Complexes 1 and 2 have similar 1D chain structures. Ln^3＋ ion is nine-coordinated by six oxygen atoms of carboxylate groups and three oxygen atom of water molecules. Ln^3＋ ions are linked by bmdc ligands to form a 1D helical chain. The right- and left-handed chains are further connected to form 3D network via interchain hydrogen bonds and π-π stacking interactions. The two complexes behave characteristic fluorescence of Eu3＋ and Dy3＋ ions, respectively. CCDC： 883519, 1; 883518, 2.