Insight into hexanuclear peroxotantalum complexes:synthesis,characterization,and efficient catalyst for amidation reaction  

作　　者：Wei-Xin Du Meng-Yuan Cheng Ke Li Ya-Chun Ma Jing-Wen Shi Dong-Di Zhang 

机构地区：[1]Henan Key Laboratory of Polyoxometalate Chemistry,College of Chemistry and Chemical Engineering,Henan University,Kaifeng,475004,China [2]Jiangxi Province Key Laboratory of Synthetic Chemistry,Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation,East China University of Technology,Nanchang,330013,China

出　　处：《Tungsten》2022年第2期158-167,共10页钨科技（英文）

基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos. 21671056 and 22071045);the Program for Science & Technology Innovation Talents in Universities of Henan Province (Grant No. 19HASTIT044);Excellent Youth Science Fund Project of Henan Province (Grant No. 202300410042)

摘　　要：Polyoxometalates(POMs),large oxoanions of the group 5 and 6 elements,attract attention due to their use as oxidation-stable catalysts and ligands.Different from the well-known V,Mo,and W POMs,the group V POMs of Ta assemble and are stable only in highly alkaline solution rather than acidic solution.In this paper,we successfully synthesized and structurally characterized two unprecedented peroxotantalum-containing clusters,KNa_(2)[HSe_(2)(TaO_(2))_(6)(OH)_(4)(H_(2)O)_(2)O_(13)]·15H_(2)O(1)and Cs_(2)K_(1.5)Na_(1.5)[Se_(4)(TaO_(2))_(6)(OH)_(3)O_(18)]·17H_(2)O(2),which comprises a 6-peroxo-6-tantalum core stabilized by two and four selenite centers,respectively.The simple,one-pot synthesis of 1 and 2 involving addition of sodium selenite into the acidified hexatantalate aqueous solution in the presence of hydrogen peroxide could represent a general procedure for incorporating heteroatoms into peroxo-polyoxotantalate species,thus opening new possibilities for this emergent branch of polyoxotantalate chemistry.Moreover,the catalytic properties of these two compounds were investigated using succinic anhydride and phenylamine as the model substrate,and compound 2 presents excellent catalytic activity in the amidation reactions of anhydrides and amines.

关 键 词：Polyoxotantalate SELENIUM PEROXO Amidation reaction AMIDES 

分 类 号：O641.4[理学—物理化学] O643.36[理学—化学]