**3.2 Electroactivity of the Pt-polymer film**

The obtained polymer films adhere Pt-electrode -after preparation at the optimum conditions of preparation (0.04M monomer and 0.6M Acid for OCP and 0.08M monomer

Electropolymerization of Some Ortho-Substituted Phenol Derivatives on Pt-Electrode from

Scheme 2. The mechanism of electropolymerization of OHP.

above suggested structures in schemes 1and 2.

**spectroscopic an 3.4.1 Elemental analysis** 

Table 2

**3.4 Structure determination of the obtained polymers by elemental and** 

Elemental analysis of the obtained polymers by anodic oxidative Electropolymerization of OCP and OHP were carried out in the micro- analytical laboratory at Cairo University. The percentage C, H, Cl and S for all investigated polymers samples are summarized in

The found elemental analyses are in a good agreement with the calculated data for the

The anodic oxidative polymerization of OHP is preceded in different steps as follows;

Aqueous Acidic Solution; Kinetics, Mechanism, Electrochemical Studies and Characterization of… 35

and 0.6M Acid for OHP at 303 K using 25 mV s-1)- were transferred to another cell with only 0.6M H2SO4 and cycled in the same range as the above work. The obtained date shows that, the oxidation peaks that was developed at +863 SCE and +622 mV vs. SCE for OCP and OHP respectively were disappear completely but the H2 peak (developed at -300 and -200 mV vs. SCE for OCP and OHP respectively) are still found and a broad reduction peaks is observed (at ~ 300 and 200mV vs. SCE for OCP and OHP respectively) which is attributed to the reduction of the formed polymer films. The lack of oxidation peaks confirm the insulating properties of the films and lake of active species inside the polymer films. By repetitive cycling, the current of peak I still the same where the current of peak II decreases as a result of decreasing the polymer amount on Pt surface.

### **3.3 Mechanisms of electropolymerization**

The anodic oxidative polymerization of OCP is preceded in different steps as follows:

Scheme 1. The mechanism of electropolymerization of OCP.

The anodic oxidative polymerization of OHP is preceded in different steps as follows;

Scheme 2. The mechanism of electropolymerization of OHP.
