Abstract Novel mixed oligoheterocycles 1-5, containing thiophene/thiazole, thiophene/1, 3, 4- thiadiazole, thiophene/oxazole, or thiophene/1, 3, 4-oxadiazole moieties, were synthesized. The introduction of electronegative heteroatoms such as oxygen and nitrogen into the conjugated π-system leads to a more pronounced acceptor character than that found in the analogous oligothiophenes. Characterization of the redox properties reveals that the ...