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Four tartaric acid-bridged tetra-europium(III)-containing antimonotungstate with catalytic oxidation of thioethers/alcohols
Yuanping Jiang, Haoqi Liu, Jiawei Zhang, Luying Jiao, Xiaoling Lin*, Fuhua Zhang, Guoping Yang*
https://doi.org/10.1016/j.cjsc.2025.100603
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.
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