Comparative study of catalytic activity of tetrameric lanthanide-substituted polyoxotungstates [(Ln2XW10O38)4(W3O8)(OH)4(H2O)2]n- (X = SiIV, GeIV & PV and n=26 or 25) for the oxidation of alcohols

The catalytic activity of tetrameric lanthanide-substituted phospho, germano and silicotungstate with the formula [(Ln(2)XW(10)O(38))(4)(W3O8)(OH)(4)(H2O)(2)](n-) (X = Si-IV, Ge-IV & P-V and n = 26 or 25) {Ln(8)X(4)W(40)} = (X = Si-IV, Ge-IV or P-V) has been investigated for the oxidation of alcohol derivatives in homogeneous medium. The comparative study shows that the lanthanide-substituted phosphotungstates possesses better catalytic activity over the silico and germanotungstate analogues. The reaction was carried out in eco-friendly solvent (water) in presence of green oxidant (H2O2). The recovered catalysts were characterized by FT-IR spectroscopy and powder X-ray diffraction (PXRD). The catalysts are stable and can be recovered even after five consecutive cycles of reaction with only a slight loss in its catalytic activity.

Automated summary

The catalytic activity of tetrameric lanthanide-substituted phospho, germano, and silicotungstate compounds was investigated for the oxidation of alcohol derivatives. The study found that the lanthanide-substituted phosphotungstates exhibited better catalytic activity compared to the silico and germanotungstate analogues. The reaction was carried out in an environmentally friendly solvent (water) in the presence of a green oxidant (H2O2). The recovered catalysts were characterized using FT-IR spectroscopy and powder X-ray diffraction. The catalysts showed stability and could be reused with only a slight decrease in catalytic activity after five consecutive cycles.