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Various fluorene-based organoboron compounds are synthesized from 2-bromo or iodo-fluorenyl boronic pinacol ester via Kumada, Heck and Stille coupling reactions. The results provide a new protocol to synthesize sophisticated arylboron compounds and monodisperse conjugated oligomers with reactive end-capping groups as building blocks/intermediates for construction of complicated conjugated system.

Three alternating conjugated polymers (P-bTC10, P-bTC12, and P-bTC16) comprising a novel S- and N-containing heteroarene, i.e., N-dodecyldithieno[2,3-b;7,6-b]carbazole, and 4,4′-dialkyl-2,2′-bithiophenes have been designed and synthesized. The nitrogen atom in the heteroarene allows introducing an additional alkyl substituent in each repeating unit of the polymers. The resulting polymers are thermally stable with decomposition temperature of ∼400 °C and highly soluble in various organic solvents, such as tetrahydrofuran (THF), toluene, chloroform, and chlorobenzene, etc. Bottom gate, top contact OTFT devices were fabricated by solution casting. Mobility of the devices increased with an increase of the alkyl chain length in bithiophene units, and P-bTC10, P-bTC12, and P-bTC16exhibited the mobilities up to 0.0064, 0.022, and 0.035 cm2/(V s), respectively. The mobility of P-bTC16is comparable to that of regioregular poly(3-hexylthiophene) (rr-P3HT) reference devices, indicating that this heteroarene is a potential building block for high-mobility conjugated polymers. [ABSTRACT FROM AUTHOR]

One-pot reduction of 9,10-diaryl-9,10-dihydrophenanthrene-9,10-diols to 9,10-diarylphenanthrenes was achieved with Zn/Hin acetic acid. Accordingly, various novel phenanthrenes and polyphenanthrenes with efficient blue emission were easily synthesized. [ABSTRACT FROM AUTHOR]