Synthesis,Structure and Catalytic Behaviour in Oxidation of Cyclohexene of K 4 H 2 [SiW 5 Mo 6 M(H 2 O)O 39 ]· x H 2 O (M=Mn 2+,Co 2+,Ni 2+,Cu 2+,Zn 2+,Cd 2+ )
Free accessResearch articleFirst published online February, 2004
Synthesis,Structure and Catalytic Behaviour in Oxidation of Cyclohexene of K 4 H 2 [SiW 5 Mo 6 M(H 2 O)O 39 ]· x H 2 O (M=Mn 2+,Co 2+,Ni 2+,Cu 2+,Zn 2+,Cd 2+ )
A series of the title complexes were synthesised. The general molecular formula K4H2[SiW5Mo6M(H2O)O39]·xH2O denoted as MW5 (M=Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+) was determined by means of chemical analysis and thermoanalysis. IR-spectra, UV-spectra, XPS-spectra, and thermal decomposition were systematically investigated. The crystal structure of K4H2[SiW5Mo6Mn(H2O)O39]·22H2O was determined. The compounds were studied in oxidation of cyclohexene with 30% hydrogen peroxide as oxidant, which indicated that these transition-metal-substituted polyoxometalates were more effective than their corresponding parent compounds.
