INVESTIGATIONS OF ELECTROCHEMICAL AND SPECTROELECTROCHEMICAL PROPERTIES (UV-Vis, EPR) OF THIOPHENE TRIMER DERIVATIVES SUBSTITUTED WITH PHENYLVINYL GROUPS

摘要

The results of investigations concerning electrochemical properties of two thiophene trimers derivatives substituted with phenylvinyl groups {3'[(E)-2-phenylethenyl]-2,2':5',2"-thiophene (monomer A) and 4,4"-didecyloxy-3'[(E)-2-phenylethenyl]-2,2':5',2"-thiophene (monomer B)} and the products of their oxidation were discussed. Electropolymerizations of A and B monomers were carried out with use of cyclic voltammetry and electrochemical measurements were coupled in-situ with spectroscopic methods (UV-Vis, EPR). It was found that A monomer oxidized to oligomers soluble in dichloromethane (Fig. 1—4 and 7) while monomer B showed ability to form stable conductive polymer layers showing low-energy forbidden band (1.6 eV) (Fig. 1,5,6 and 8,9).