Abstract
The catalytic activity of tetrameric lanthanide-substituted phospho, germano and silicotungstate with the formula [(Ln2XW10O38)4(W3O8)(OH)4(H2O)2]n− (X = SiIV, GeIV & PV and n = 26 or 25) {Ln8X4W40} (X = SiIV, GeIV or PV) 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.
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