配合物[Ho2（bpdc）3·（H2O）4]·5H2O的合成及晶体结构研究

在水热条件下,合成配合物Ho2（bpdc）3·（H2O）4].5H2O单晶（bpdc为2,2＇-联吡啶-6,6＇二羧酸）.配合物晶体属于三斜晶系,P-1空间群.在晶体结构中含有2种独立配位模式Ho3＋,其配位构型都是八配位的扭曲四方反棱柱体.一种为一个配体H2bipy上的2个氮原子和2个羧基氧原子采用螯合配位占据四方反棱柱体的4个顶点位置,同时余下4个顶点位置被4个配位水分子占据;另一种是2个配体H2bpdc上的4个氮原子与4个羧基上的氧原子配位形成八配位的扭曲四方反棱柱体构型.配合物分子之间通过分子内和分子间的氢键作用与π-π堆积作用进一步形成三维框架结构.

Study on Synthesis and Crystal Structure of a Complex [Ho_2（bpdc）_3 ·（H_2O）_4] · 5H_2O

In hydrothermal condition,the complexHo2（bpdc）3 ·（H2O）4] · 5H2O was synthesized.（H2bpdc=2,2′-Bipyridine-6,6′-dicarboxylic acid）.The crystal belongs to triclinic system,P-1 space group.Holmium ion acts as two types of coordinated modes.The two types are both eight-coordinated and a pseudo square antiprismatic structure.One coordinated mode is coordinated by a H2bpdc ligand.Two nitrogen atoms and two oxygen atoms were coordinated and taken on four vertexs of the structure with four oxygen atoms in water molecules on the other four vertexs.The other type is two H2bpdc chelated to Ho3＋ with four nitrogen atoms and four oxygen atoms from four carboxylic groups rendered a eight-coordinated and a pseudo square antiprismatic structure.The complex with a 3-D framework structure was formed via hydrogen bond and π-π stacking interactions inside between the molecules.