Aniline (ANI) and 2-aminoterephthalic acid (2ATA) copolymers, with different compositions, were prepared by chemical oxidative polymerization varying the feed ratio. The new materials have been characterized by techniques such as XPS, FTIR, Raman spectroscopies and thermal analysis. It has been checked that 2ATA units are included in the polymer backbone. Different properties have been studied as solubility, conductivity, optical absorption, fluorescence and electroactivity. The copolymers are soluble in aqueous alkaline medium and show clear electroactivity in aqueous acid medium.