2-吡嗪甲酸修饰稀土铈嵌入的同多钨酸盐的合成、结构和表征  

Synthesis,structure and characterization of 2-pyrazinecarboxylic acid decorated Ce^(III)-incorporated isopolyoxotungstate

作　　者：牛靖阳 钱水 曾宝兴 赵俊伟[1] NIU Jingyang;QIAN Shui;ZENG Baoxing;ZHAO Junwei(College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,Henan,China)

机构地区：[1]河南大学化学化工学院,河南开封475004

出　　处：《化学研究》2022年第5期437-443,共7页Chemical Research

摘　　要：在水溶液中采用分步组装方法,合成了一种新型铈取代的同多钨酸盐[(CH_(3))_(2)NH_(2)]_(6)KNa_(3)[Ce_(2)(H_(2)O)_(6)W_(22)O_(74)(HPCA)_(2)]·28H_(2)O(1),通过X射线单晶衍射、红外光谱和热重分析对其进行了表征。结构分析表明,二聚多阴离子[Ce 2(H_(2)O)_(6)W_(22)O_(74)(HPCA)_(2)]^(10-)是由两个[W_(11)O_(38)]^(10-)片段和两个金属有机[Ce(H_(2)O)_(3)(HCA)]^(3+)离子组成。此外,每个[Ce(H_(2)O)_(3)(HPCA)]^(3+)片段不仅通过三个氧原子接枝到两个[W_(11)O_(38)]^(10-)片段的空位上,还与另外一个[W_(11)O_(38)]^(10-)构筑单元的氧原子配位,构建了一维链结构。显然,[Ce(H_(2)O)_(3)(HCA)]^(3+)片段在该一维链结构的形成中发挥了非常重要的桥连作用。A novel Ce^(III)-incorporated isopolyoxotungstate[(CH_(3))_(2)NH_(2)]_(6)KNa_(3)[Ce_(2)(H_(2)O)_(6)W_(22)O_(74)(HPCA)_(2)]·28H_(2)O(1,HPCA=2-pyrazinecarboxylic acid)was triumphantly prepared by step-by-step assembly strategy in aqueous medium and characterized by single-crystal X-ray diffraction,IR spectrum and thermogravimetric analysis.Structural analysis indicates that its polyoxoanion[Ce_(2)(H_(2)O)_(6)W_(22)O_(74)(HPCA)_(2)]^(10-)is constituted by two[W_(11)O_(38)]^(10-)segments and two metal-organic[Ce(H_(2)O)_(3)(HPCA)]^(3+)cations.In addition,each[Ce(H_(2)O)_(3)(HPCA)]^(3+)cation is not only grafted to the vacancy of two[W_(11)O_(38)]^(10-)units through three oxygen atoms,but is combined with[W_(11)O_(38)]^(10-)units to form a one-dimensional chain structure.Apparently,[Ce(H_(2)O)_(3)(HPCA)]^(3+)cations play an important bridging role in the structure construction of the one-dimensional chain structure.

关 键 词：多金属氧酸盐 同多钨氧酸盐 稀土取代的多钨氧酸盐 

分 类 号：O614.3[理学—无机化学]