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This study reports the first syntheses and characterization of 2,7-carbazolenevinylene-based oligomers and polymers. Their relatively straightforward syntheses are mainly based on Horner−Emmons or Knoevenagel coupling reaction leading to well-defined oligomers and polymers. As expected, introduction of vinylene and cyanovinylene unit into the polymer backbone decreases the band gap allowing a fine-tuning of the optical and electrical properties. These electroactive and photoactive organic materials exhibit promising performances in light-emitting devices and field-effect transistors. For instance, preliminary measurements using poly( N -(2-ethylhexyl)-2,7-carbazolenecyanovinylene- alt -2,5-dioctyloxy-1,4-phenylenevinylene) (PCCVP) have revealed orange-red emission with an intensity of 245 cd/m 2 at 10 V, whereas p -type mobility of about 3.7 × 10 - 2 cm 2 /V·s and an on/off ratio as high as 10 6 were reached with 1,4-bis(vinylene-( N -hexyl-2-carbazole))phenylene (CPC).
Morin et al. (Fri,) studied this question.