Yuanping Jiang, Haoqi Liu, Jiawei Zhang, Luying Jiao, Xiaoling Lin*, Fuhua Zhang, Guoping Yang*

Cite this article: Chin. J. Struct. Chem., 2025, 44(7), 100603. DOI: 10.1016/j.cjsc.2025.100603

Publication date: July 1, 2025

Keywords: Antimonotungstate; Tartaric acid; Catalytic oxidation; Thioethers; Alcohols

ABSTRACT

A novel tetra-europium(III)-containing antimonotungstate, Na8.2[H2N(CH3)2]9[Na10.8(tar)4(H2O)20(Eu2Sb2W21O72)2]·44.5H2O (EuSbW, H4tar = DL-tartaric acid), has been synthesized and characterized. The dimeric polyoxoanion of EuSbW consists of two Dawson-like {Eu2Sb2W21} units bridged by four DL-tartaric acid ligands. The adjacent carboxyl and hydroxy groups in each tartaric acid simultaneously chelate with W and Eu atoms from different {Eu2Sb2W21} units, thereby forming the dimeric structure. EuSbW represents an extremely rare polyoxometalates where four tartaric acid ligands function as connectors to bridge two {Eu2Sb2W21} units. Additionally, EuSbW exhibits excellent catalytic activity and reusability in the oxidation of thioethers and alcohols, achieving 100% conversion and >99% selectivity for various thioethers, and 85-100% conversion with 90-99% selectivity for diverse alcohols under mild conditions.