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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%。
In this paper, we report a novel microporous coordination polymer: [Gd (H2betc) 0.5 (betc) 0.5 (H2O)] n · 2nH2O (H4betc = 1,2,4,5-Benzenetetracarboxylic acid). The crystal structure was determined by X-ray single crystal diffractometer and elemental analysis, infrared and other properties were measured. The results of the crystal structure study show that the structure is monoclinic and the space group is P21 / n. Gd (III) ions form a Gd-O chain through oxygen atom bridging, Gd-O chain through the bridging effect of pyromellitic acid ligand to form Gd-betc layer structure. The Gd-betc layer further forms a three-dimensional network structure with one-dimensional pores by bridging the pyromellitic acid ligands. After deducting the water molecules in the pores, the porosity in this structure is about 17.6%.