Electrochemical quartz crystal microbalance (EQCM) technique was used to me
asure the ion transfer in redox processes in electroactive organic thin fil
ms, such as self-assembled monolayer (SAM) (4-pyridyl hydroquinone, abbr. 4
PHQ), multilayer based on SAM and conducting polymer film (here poly-(3,4-e
thylenedioxythiophene), abbr. PEDOT). A mechanism of mixed ion transfer is
developed and presented. Analysis of mixed ion transfer during redox proces
ses successfully elucidates the deviation of oscillation frequency of the q
uartz crystal from theoretical expectation.