Investigations of electrochemical and spectroelectrochemical properties (UV-Vis, EPR) of thiophene trimer derivatives substituted with phenylvinyl groups.

The results of investigations concerning electrochem. properties of two thiophene trimers derivs. 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 oxidn. were discussed. Electropolymns. of A and B monomers were carried out with use of cyclic voltammetry and electrochem. measurements were coupled in-situ with spectroscopic methods (UV-Vis, EPR). It was found that A monomer oxidized to oligomers sol. in dichloromethane while monomer B showed ability to form stable conductive polymer layers showing low-energy forbidden band (1.6 eV).