Polymerization of Two Unsymmetrical Isomeric Monomers Based on Thieno[3,4-b]thiophene Containing Cyanovinylene Spacers

摘要: Two cyanovinylene-containing isomeric monomers were prepared by the Knoevenagel condensation of 4- and 6-formylthieno[3,4-b]thiophene with thiophene-2-acetonitrile, these electrochemically polymerized to yield two low-band-gap (1.2 eV) conjugated polymers. The onsets for oxidation polymers found have shifted ca. 0.6 V higher compared parent poly(thieno[3,4-b]thiophene) onset reduction increased 0.1 V. Both polymers, according spectroscopic evidence, be deep blue in neutral state transmissive sky oxidized form, exhibit stable n-doping behavior.