Related Experiment Video
Updated: Dec 10, 2025
Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
Three ring-shaped Zr(iv)-substituted silicotungstates: syntheses, structures and their properties
Zhong Zhang1, Yue-Lin Wang, Yan Liu
1MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China. ygy@bit.edu.cn.
Abstract:
Three Zr(iv)-substituted polyoxometalate nanoclusters, H16(H2dap)4[{Zr2(OH)2(α-SiW10O38)}2{Zr2(OH)2(β-SiW10O38)}2]·8H2O (1, dap = 1,3-diaminopropane), H17Na9[(Zr2(OH)2)2(Zr2BO(OH)4)2(β-SiW10O38)4]·50H2O (2) and H20Na8[(Zr2BO(OH)4)2(Zr2B2O2(OH)5)2(β-SiW10O38)4]·40H2O (3), were made by a hydrothermal reaction of trivacant [A-α-SiW9O34]10-, Zr4+ ions, and H3BO3 under different alkaline conditions. Single-crystal X-ray structure analysis revealed that they are ring-shaped polyoxotungstate aggregates built by Zr2(OH)2 ({Zr2}) clusters and two types of dilacunary α-/β-SiW10O38 ({α-/β-SiW10}) fragments for 1, {Zr2}, {β-SiW10}, and Zr2BO(OH)4 ({Zr2B}) clusters for 2, and {β-SiW10}, {Zr2B}, and Zr2B2O2(OH)5 ({Zr2B2}) clusters for 3, respectively, showing that the Zr-B-O clusters, {Zr2B} and {Zr2B2}, have been introduced to the lacunary sites of polyoxometalates for the first time. The electrochemistry and electrocatalytic properties of 2 were studied, and it exhibited effective catalytic activities for the reduction of H2O2, NO2-, and BrO3-. Moreover, the catalysis of 2 for the oxidation reactions of various thioethers was investigated, and it was found that 2 possessed high conversion and remarkable selectivity.
Related Concept Videos
02:42Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:26Preparation and Reactions of Sulfides
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
02:27Predicting Molecular Geometry