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Abstract
The Electrochemical Impedance Technique (EIS) and the Cyclic Voltammetric method (CV) were used to investigate the behavior of purpurin (P), Anthrapurpurin (AP) and Benzopurpurin (BP) in aqueous and in N, N-dimethylformamide (DMF) media. In the CV experiments, both the radical and the dianion of these substances were assumed to form of limited stability due to chemical protonation. In case of benzopurpurin, the CV measurements in DMF revealed a cis-trans isomerization changes of the molecule. The CV study includes also simulation of some responses using appropriate theoretical fitting models to confirm proposed reaction rates. The EIS experiments were carried out using a small AC amplitude and a relatively wide frequency range. The diagrams are characterized in the complex plane by the demonization of the Warburg impedance behavior at low frequencies and the appearance of two uncompleted semicircles in the Nyquist plot of the complex plane.
Highlights
Redox processes involving electron transfer may have different routes
The present work aims to shed some light on the elerctrochemical behavior of preparing, anthrapurpurin and benzopurpurin (I-III) using the electrochemical impedance spectroscopy (EIS) and the cyclic voltammetric (CV) techniques in both aqueous and aprotic media
The reference electrode was either an Ag/AgCl used in non-aqueous media or the saturated calomel electrode (SCE) used in aqueous solutions
Summary
Redox processes involving electron transfer may have different routes. In addition to the difficulties of the energy barrier characterizing each electronic transfer, complications of coupled follow-up chemical reactions or conformatic changes might arise. These difficulties can, be clarified by modifying the experimental conditions. Dietz and Peover[2] investigated a series of stilbene derivatives, where the relevant electrode reaction involved neutral molecule/anion radical redox couples. The present work aims to shed some light on the elerctrochemical behavior of preparing, anthrapurpurin and benzopurpurin (I-III) using the electrochemical impedance spectroscopy (EIS) and the cyclic voltammetric (CV) techniques in both aqueous and aprotic media
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