Double Trigonal Pyramidal {SeO3} Groups Bridging Gadolinium-Substituted Dawson Selenotungstate for Catalytic
Xiaoling Lin1, Haozhe Wang1, Jiawei Cao1
1Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, School of Chemistry and Materials Science, East China University of Technology, Nanchang 330013, China.
Abstract:
A novel double trigonal pyramidal {SeO3}-bridged, gadolinium-substituted Dawson-type selenotungstate, (NH4)8Na10[GdSeW2O8(H2O)5]2[Se2W14O52]2·41H2O (GdSeW), was successfully synthesized through a one-step assembly strategy. The most striking feature of its structure lies in the dual role of {SeO3}, not only functioning as a heteroatom template to construct Dawson-type {Se2W14O52} units, but also acting as a linker to bridge the two units, thereby forming a dumbbell-shaped architecture. Furthermore, GdSeW exhibits remarkable catalytic activity as a Lewis acid catalyst for the condensation reaction of 2-acetylbenzoic acid and amines, affording the valuable isoindolinones with yields up to 96%. The catalytic system demonstrates broad substrate compatibility, efficiently accommodating a range of benzylamines, anilines, and aliphatic amines. Control experiments and recycling tests confirm the heterogeneous nature and stability of GdSeW under reaction conditions. This work expands the structural diversity of lanthanide-containing polyoxometalates and highlights their potential application in organic transformations.
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Structural 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,...
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
