Abstract
This review summarizes the studies dealing with unmodified and modified copper polyoxometalates (Cu-POMs) as catalysts for oxidation of alkenes. Effect of modifications such as incorporation of second copper as well as functionalization with organic ligand has been discussed in the form of case studies. Further, light has been shed on the kinetics of the reaction as well as mechanistic studies. It was found that the activity of the catalysts is deeply enhanced by presence of a second copper, as seen from the lower activation energy (Ea for mono-copper POM – 64.81kJmol−1; 57.64 kJmol−1 for di-copper POM for styrene oxidation). Similar results are obtained when environment around the copper is changes by functionalization (Ea for functionalized Cu-POM – 32.66 kJmol−1 for styrene oxidation).
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