Synthesis and Properties of Conjugated Poly(1,8-carbazole)s

During our search of novel conjugated carbazole polymers, we succeeded in the efficient synthesis of conjugated Poly(1,8-carbazole) derivatives The synthetic toute to the 1,8-difunctionalized carbazole monomers and the polymerization methods under the Yamamoto, Sonogashira, and Hay conditions were established The obtained poly(1,8-carbazole)s were comprehensively characterized by GPC. MALDI-TOF MS, H-1 NMR, and IR spectroscopies, and it was found that the alkyne spacer is an important factor in obtaining the high molecular weight polymers. Thermal analysis revealed that the alkyne-linked poly( 1,8-carbazole)s possess a higher thermal stability than the directly linked poly(1,8-carbazole) The energy diagrams of it series of polycarbazoles were carefully estimated from the electrochemical and optical measurements The alkyne-linked carbazole polymers were potent blue-light-emitting polymers due to then narrow band gaps. Furthermore, the remarkable decreased aggregation behavior of the butadiynylene-linked poly(1,8-carbazole) was demonstrated.