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| - Electrochemical Behavior of LB Films Containing a Mixture of Viologen and aPhospholipid
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| - The electrochemical behavior of mixed monolayers of N-tetradecyl-N‘-methyl viologen (TMV) and l-α-dimyristoylphosphatidic acid (DMPA) has been studied. Mixed monolayers of TMV/DMPA = 1:2 havebeen obtained at the air−water interface and transferred by the Langmuir−Blodgett (LB) method at π = 40mN m-1 onto In and Sn oxide (ITO) electrodes. These LB films were used as the working electrode in aconventional electrochemical cell and immersed in aqueous solutions with different electrolytes. The influenceof the type and the electrolyte concentration on the voltammetric peaks related to the two one-electron processesof TMV has been studied. The formation of an insoluble salt of viologen perchlorate on the surface of theelectrode is observed when concentrations of perchlorate higher than 0.3 M are used. Due to this, a reorientationof the polar group of the viologen in the transferred mixed monolayer from a flat to a perpendicular positionis postulated.
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