摘要
水热条件下合成了3个镧系间苯二甲酸的配位聚合物[Ln2(ip)3(H2O)2]n·n(H2O)(H2ip=间苯二甲酸,Ln=Pr(1),Eu(2),n=0;Ln=Ho(3),n=1).用X射线单晶衍射法测定了3个配合物的晶体结构,它们皆属单斜晶系,空间群P2(1)/n.配合物1和2为双核单元的同构晶体,两个独立的晶体学金属中心分别为七配位的五角双锥和八配位的二帽三角棱柱构型;而配合物3略有不同,金属离子分别处于七配位的单帽三角棱柱和八配位的扭变二帽三角棱柱构型中.3个配合物中都存在由间苯二甲酸连接成的左旋和右旋的金属链构成的二维网状结构.热分析结果表明,3个配合物受热后分两步失去水分子,再一步分解为Ln2O3.配合物的荧光光谱表明,铕配合物与其脱水产物均具有较强的荧光性质.
Three isophthalate coordination polymers with formula of [Ln2（ip）3（H20）2]n·n（H20） （H2ip= isophthalic acid, Ln=Pr （1）, Eu （2）, n=0; Ln=Ho （3）, n= 1）, were prepared under a hydrothermal condition and characterized by elemental analysis, infrared spectrum, thermal analysis and X-ray single crystal diffraction techniques. All these complexes crystallized in a monoclinic crystal system, P2（1）/n space group. Complexes 1 and 2 are isostructural with dinuclear Ln（Ⅲ） units in which two metal ions lie in seven- and eight-coordinated environments, respectively, belonging to penta bipyramid and bicapped trigonal prism geometries, while complex 3 is slightly different with the complexes 1 and 2, in which Ho（III） centers locate in monocapped and bicapped trigonal prism geometries, respectively. In these complexes, adjacent metal ions are linked by ip ligands causing right- and left-handed helical chains to form a two dimensional network. Fluorescence spectrum in solid state of complex 2 and its dehydrated products showed strong fluorescence properties.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2008年第14期1663-1668,共6页
Acta Chimica Sinica
基金
国家自然科学基金(No.20771089)
陕西省自然科学基金(No.2007B02)资助项目
关键词
间苯二甲酸
镧系配合物
晶体结构
荧光光谱
isophthalic acid
lanthanide complex
crystal structure
fluorescence spectrum
