TAILORING RECEPTORS TO SEMICONDUCTING POLYMERS - PREPARATION AND OPTICAL CHARACTERIZATION

New Thiophene based polymers: poly-6,6'-(2-thienyl)-2,2'-bipyridine (p -262-bT-bPy), and poly-6,6'-(3-thienyl)-2,2'-bipyridine (p-362-bT-bPy) were synthesized and characterized. The measured photoinduced absorpt ion spectrum of p-262-bT-bPy consists of several broad bands peaked at 0.55 eV, 1.1 eV and 1.9 eV. Due to the shape of these bands and the p resence of photoinduced phonons (IRAV), the mainly photoexcited specie s are assigned to polarons, bipolarons and a triplet exciton. An elect roluminescent device where the active element is p-262-bT-bPy was prep ared. In contrast to (p-262-bT-bPy), p-362-bT-bPy exhibit photophysica l properties resembling nonfunctionalized polythiophene systems. Here, the bipyridine subunits are believed to act simply as cross links bet ween the polythiophene chains.