微孔配位聚合物[Gd(H_2betc)_(0.5)(betc)_(0.5)(H_2O)]_n·2nH_2O的合成及晶体结构研究

SYNTHESIS,CRYSTAL STRUCTURE OF A POROUS COORDINATION POLYMER:[Gd(H_2betc)_(0.5)(betc)_(0.5)(H_2O)]_n·2nH_2O

本文报道了一个新的微孔配位聚合物:[Gd(H2betc)0.5(betc)0.5(H2O)]n·2nH2O(H4betc=1,2,4,5-Benzenetetracarboxylic acid,均苯四甲酸)。通过X射线单晶衍射仪测定其晶体结构,并进行了元素分析,红外等性质测定。晶体结构研究结果表明,其结构为单斜晶系,空间群为P21/n。Gd(Ⅲ)离子通过氧原子的桥连作用形成一条Gd-O链,Gd-O链再通过均苯四甲酸配体的桥连作用,形成Gd-betc层结构。Gd-betc层进一步通过均苯四甲酸配体的桥连作用形成具有一维孔道的三维网状结构。扣除孔道中的水分子,这个结构中的孔洞率约为17.6%。

A new porous coordination polymer： [Gd（H2betc）（0.5）（betc）（0.5）（H2O）]n·2nH2O （H4betc = 1,2,4,5-Benzenetetracarboxylic acid） has been reported in this paper. Its structure was characterized by X-ray single-crystal, elemental analyses and IR. It was crystallized in monoclinic, P21/n. In this compound, by the crosslink of the O atom, the Gd（III） ions formed a Gd-O chain. The Gd-O chain were further bridged by the 1,2,4,5-Benzenetetracarboxylic acid ligands into a Gd-betc layer structure. The Gd-betc layers were further linked by the 1,2,4,5-Benzenetetracarboxylic acid ligands into a 3D network structure with a 1D channel. The void ratio of this structure was 17.6%, without considering the lattic water molecules.