过氧钛钨硅杂多配合物的合成、表征及催化活性

Synthesis,Characterization and Oxidation Activity of Peroxotitanium-containing Heteropolytungstates with Keggin Structure

合成了过氧钛钨硅杂多酸盐α-M_(6-m)H_m[SiW_(11)(TiO_2)O_(39)]·xH_2O和α-M_(10-m)H_m[SiW_9(TiO_2)_3O_(37)]·xH_2O(M=K,TBA),用IR,UV吸收光谱,极谱-循环伏安,^(183)W NMR,XPS和XRD等测试方法对其性质、结构进行研究.结果表明,它们都是具有Keggin结构的过氧杂多配合物,TiO_2基团的引人将其极谱半波电位提高至-0.3V以上,它们对顺丁烯二酸的H_2O_2环氧化反应具有显著高的催化活性.

Six new complexes a-M6-mHm[SiW11(TiO2)O39]·xH2O, a - M10 -m Hm [ SiW9(TiO2)3O37]·xH2O and a-M6-mHm[SiW11TiO40]·xH2O(M=K,TBA) were synthesized and characterized by IR and UV spectroscopy,polarography and cyclic voltammetric,183W NMR,XPS and XRD methods. The experimental results indicate that they are all the Keggin structure and the reduced electric potential of the complexes arise over - 3.0V with entering of TiO2 groups. This complexes had high activity for the epoxidation of Maleic acid using H2O2 oxidant.