α-和β-Cs_4H_3[SiW_9O_(37)Cr_3(H_2O)_3]·xH_2O的合成及其催化PhIO环氧化烯烃的性质

Synthesis of α- and β-Cs_4H_3[SiW_3O_(37)Cr_3(H_2O)_3] · xH_2O and Their Catalysis of Epoxidation of Olefin by PhIO

本文报道了α-和β-[SiW_9O_(37)Cr_3(H_2O)_3]^(7-)杂多阴离子铯、钾盐的合成、表征及其催化亚碘酰苯环氧化烯烃的性质.元素分析、磁化率、红外光谱及FAB质谱等数据表明,该杂多阴离子为三取代的Keggin结构.α-和β-[siW_9O_(37)aCr_3(H_2O)_3]^(7-)具有催化PhIO环氧化反-二苯乙烯、环己烯和苯乙烯生成相应环氧化物的性质。

The synthesis of α- and β-Cs<H3[SiW9O37Cr3(H2O)3] β xH2O and their catalysis for epoxi-dation of olefin are reported. The heteropolyacid salts have an ability to catalyze the epoxidation of olefin by PhIO, and the catalytic activity of them is probably related to the fact that the substituted Cr ( Ⅲ ) can be oxidized to a higher oxidation state and the compound with a higher oxidation state has an oxidation property.