Self-Assembly of a U(VI)-Containing Polytungstate Tetramer with Lewis Acid-Base Catalytic Activity for a Dehydration Condensation Reaction
作者:Yu-Feng Liu、Ke Li、Hui-Yong Lian、Xue-Jiao Chen、Xing-Lei Zhang、Guo-Ping Yang
DOI:10.1021/acs.inorgchem.2c02918
日期:2022.12.19
[K2(UO2)4Cl0.5(OH)5.5(γ-SiW10O36)4]28–. Notably, U4 could work as an effective bifunctional Lewis acid-base catalyst for the synthesis of pyrazoles via the condensation of hydrazines with 1,3-diketones under mild conditions, which is attributed to the synergetic effect of the Lewis acidity of U(VI) and the Lewis basicity of γ-SiW10}.
新型含 U(VI) 多钨酸盐 (U-POW) 四聚体 K 1.37 Na 26.63 [K 2 (UO 2 ) 4 Cl 0.5 (OH) 5.5 (γ-SiW 10 O 36 ) 4 ]}·ca66H 2 O ( U 4 ),是使用Keggin型前体[γ-SiW 10 O 36 ] 8–和UO 2 (NO 3 ) 2合成的。4 _通过单晶 X 射线衍射、FT-IR、拉曼光谱、固态漫反射光谱、ICP-OES、ESI-MS、TGA 和 PXRD 进一步表征。中心 K 2 (UO 2 ) 4 Cl 0.5 (OH) 5.5 } 发色团由四个铀酰、四个半数 K 离子、5.5 桥接 μ 2 -OH 和无序 Cl 离子巧妙地构建,并由四个 γ-SiW 10 } 部分构建四聚体 [K 2 (UO 2 ) 4 Cl 0.5 (OH) 5.5 (γ-SiW 10 O 36 ) 4 ]28–。值得注意的是,U