摘要
ndecatungstogallates K_n[GaW_(11)O_(39)M (H_2O)]· xH_2O (M=Mn, Co , Ni , Cu ,Cr, Fe or Zn) were prepared and their redox properties in solution were investigat-ed using polarographic and cyclic voltammographic methods. Experimental resultsindicated that the heteropolyanions underwent two-step , two-electron tungsten re-duction processes, and each reduction process was accompanied by protonation.The complexes of Cu and Mn exhibit voltammetric redox features corresponding toreduction of Cu￣Ⅰ to Cu￣Ⅰ and oxidation of Mn￣Ⅱ to Mn￣Ⅲ and Mn￣Ⅳ. The title het-eropolyanions show catalysis effect on olefin epoxidation by iodosylbenzene or hy-drogen peroxide.
ndecatungstogallates K_n[GaW_(11)O_(39)M (H_2O)]· xH_2O (M=Mn, Co , Ni , Cu ,Cr, Fe or Zn) were prepared and their redox properties in solution were investigat-ed using polarographic and cyclic voltammographic methods. Experimental resultsindicated that the heteropolyanions underwent two-step , two-electron tungsten re-duction processes, and each reduction process was accompanied by protonation.The complexes of Cu and Mn exhibit voltammetric redox features corresponding toreduction of Cu￣Ⅰ to Cu￣Ⅰ and oxidation of Mn￣Ⅱ to Mn￣Ⅲ and Mn￣Ⅳ. The title het-eropolyanions show catalysis effect on olefin epoxidation by iodosylbenzene or hy-drogen peroxide.
