ELECTROCHEMICAL AND OPTICAL-PROPERTIES OF POLY (3-METHYLTHIOPHENES) ELECTROSYNTHESIZED BY 3,3'-DIMETHYL-2,2'-BITHIOPHENE, 3,4'-DIMETHYL-2,2'-BITHIOPHENE AND 4,4'-DIMETHYL-2,2'-BITHIOPHENE

3,3'-, 3,4'- and 4,4'-dimethyl-2,2'-bithiophene are used as starting molecules for electrochemical polymerization of poly(3-methylthiophenes). The resulting polymers show different optical properties, interpreted on the basis of the conformation of the starting dimers determined by force field MMP2 calculations.