Six new complexes α-M6-mHm[SiW11(TiO2)O39].xH2O, α-M10-mHm[SiW9(TiO2)3O37].xH2O and α -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 grops. This complexes had high activity for the epoxidation of Maleic acid using H2O2 oxidant.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, INFRARED SPECTROPHOTOMETRY, HETEROPOLYACID, X-RAY DIFFRACTION ANALYSIS, X-RAY PHOTOELECTRON SPECTROMETRY, HYDROGEN PEROXIDE, CYCLOVOLTAMGRAPH, CATALYTIC ACTIVITY, MALEATE