ESTER-FUNCTIONALIZED POLY(3-ALKYLTHIENYLENE)S - SUBSTITUENT EFFECTS ON THE POLYMERIZATION WITH FECL3

Ester-functionalized poly(3-alkylthienylene)s were obtained by chemica l oxidation with FeCl3. Substituents with both different total length and different distance of the ester group from the thiophene ring were examined. The main reaction solvent studied was chloroform which gave polymers with high molecular weight and incomplete conversion of the monomer. Some polymers were synthesized with a new procedure involving the precipitation of FeCl3 from a saturated nitromethane solution by a tetrachloride solution of the monomer. In this way, lower molecular weights and complete monomer conversion were obtained. The effect of d ifferent substituent groups on the polymer microstructure was examined using H-1 NMR spectroscopy. With both polymerization procedures, the regioregularity and absorption maximum in the visible spectrum increas e with increasing length of the oligomethylenic spacer between thiophe ne ring and ester group.