Dissolution Behavior of 3-Methoxythiophene Oligomer and its Effect on the Development of Gold-Like Luster

Abstract

Recently, we have synthesized oligo(3-methoxythiophene) doped with perchlorate ion and reported that the coating films exhibited gold tone luster. Although this oligomer is soluble in some polar organic solvents, the number of good solvents is limited. In this study, we identified the interaction between the oligomer and solvent as a dipole-dipole interaction, and found several good solvents. The coating films were prepared using the coating solutions of the good solvents, and their optical, color, and structural properties were investigated. The results revealed that the film with a higher luster and more intense yellowness was obtained when the solvent in which more π-dimers are formed was used for the coating solution.