**3.4.1 Elemental analysis**

34 Electropolymerization

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

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

as a result of decreasing the polymer amount on Pt surface.

Scheme 1. The mechanism of electropolymerization of OCP.

**3.3 Mechanisms of electropolymerization** 

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 Table 2

The found elemental analyses are in a good agreement with the calculated data for the above suggested structures in schemes 1and 2.

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

The absorption bands shown in the spectra are summarized in Table 3.

λmax

OCP POCP OHP POHP


212 208 --- --- --- --- 225 223 --- --- --- --- --- --- --- 273 306 307 302 305

Table 3. The Uv-vis. assignments.

**3.4.2.2 Infrared spectroscopic studies** 

assignments are given in Tables 4 and 5.

Fig. 11. IR spectra of OCP, POCP, OHP and POHP.

Aqueous Acidic Solution; Kinetics, Mechanism, Electrochemical Studies and Characterization of… 37

The infrared spectra of OCP monomer and its prepared homopolymer POCP are represented in Fig. 11(a) where the infrared spectra of OHP monomer and its prepared homopolymer POHP are represented in Fig. 11(b). The IR absorption bands and their

Assignment

π- π\* transition


Table 2. Elemental analytical data of the prepared homopolymers
