Oligo(2,5-thienyleneethynylene)s (OTE) with terminaldonor-acceptorsubstitution were synthesized by applying Sono-gashira-Hagihara reactions and a protection group technique. The combination of the alkylthio and nitro substituents provides a DAOTE series, whose long-wavelength absorption shows a monotonous bathochromic effect for increasing numbers n of repeat units. The convergence limit is already