A series of new π-conjugated donor-acceptor copolymers, based on a naphthalene-bisimide moiety as the electron-acceptor and connected to either thiophene or dialkylfluorene as the electron-donor, were synthesized. The polymers are soluble in common organic solvents. The UV-Vis spectra of the copolymers in chloroform showed two absorption maxima at higher energies (ca. 301-364 nm), assigned to the π-π* transition, and at a lower energy (ca. 512-595 nm), ascribed to the intramolecular charge transfer between donor and acceptor units. Cyclic voltammetry revealed that the polymers were susceptible to both electrochemical oxidation and reduction, and they had a LUMO and HOMO levels ranging from-4.07 to-3.80 eV and-6.13 to-5.64 eV, respectively. The energy band gaps were estimated to be 1.48-2.06 eV. These results represent a positive step towards making novel compounds suitable for electronic applications.