Hydroxy-substituted tetraphenylporphyrin was oxidatively electropolymerized from solutions in ethanol. The process of electropolymerization was carried out and studied using cyclic voltammetry, absorption spectroscopy, and electrochemical quartz microbalance. The results of the IR spectra and electronic absorption spectra show that, during the deposition from ethanol, the polymer is formed through the OH group in the phenyl substituent with the formation of C-O-C bonds. The mechanism of

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... hyrin formation is similar to the polymerization of simple organic compounds. The surface of the polyporphyrin film is smooth, the film thickness is about 80 nm. Using the Mott-Schottky approach, it was determined that the films have the hole conductivity (p-type semiconductor). The flat-band potential for poly-5,10,15,20-tetrakis (4-hydroxyphenyl) porphyrin is 0.33 V. Under the action of positive potentials in the supporting electrolyte solution, the film was further oxidized with the inclusion of supporting electrolyte anions in polyporphyrin.