We report on the mechanism of direct oxidation of 3-alkylthiophenes using ferric chloride (FeC13) as the polymerization oxidant/catalyst to produce high molecular weight poly(3-alkylthiophenes) (P3ATs), conjugated polymers that have potential as electrically and optically active polymers. This study shows that the FeCI 3 must exist in the solid state in the reaction mixture to be active as an oxidant in the polymerization of P3AT. A feasible polymerization mechanism for 3-alkylthiophene was developed on the basis of the crystal structure of FeCI 3 and quantum chemical computations of thiophene derivatives. The polymerization is hypothesized to proceed through a radical mechanism rather than a radical cation mechanism.
Посилання на статтю:
Polymerization of 3-alkylthiophenes with FeCI 3 / V. M. Niemi, P. Knuuttila and J.-E. 0sterholm // Polymer. – 1992. – Vol 33. – P. 1559-1562.