*3.3.2 Analysis of SET-PT mechanism*

In the SET-PT mechanism, the parameters involved are IP and PDE. In all derivative IP is found to be higher in both media. The PDE values are higher in the gas phase but lower in the water medium. But the lower value in the water medium cannot be used for final judgment about contribution in antioxidant activity. In the SET-PT mechanism, the PDE comes from the second step of this mechanism, whereas the first step is the IP. Since all cases have the highest values for IP in the water medium, they have to overcome this large energy barrier of IP to reach the second step.
