New heteroaromatic polymer containing quinoline moiety in the main chain, poly[2,6-(p-phenylsulfanyl)-4-phenylquinoline] (PQ-S) was synthesized by the Friedlander reaction of 1-[4-(4-amino-3-benzoylphenylsulfanyl)] ethanone, and its chemical structure was identified by IR, NMR, and elemental analysis. Due to the wholly aromatic chemical structure, PQ-S showed a high glass transition temperature of 235℃, and also excellent thermal stability revealed by initial decomposition temperature (onset temperature) as high as 513℃. PQ-S was soluble in several organic solvents such as chloroform and tetrachloroethane so that transparent thin film could be easily prepared from the solution by spin coating method. From the UV-visible absorption and emission spectra, the characteristic photoluminescence of PQ-S centered at around 420 nm was observed. It was also found that PQ-S could form the charge transfer complex with 2,4,7-trinitrofluorenone (TNF), a well-known electron acceptor.

주쇄에 퀴놀린 단위를 함유하는 새로운 복소환 고분자인 poly[2,6-(p-phenylsulfanyl)-4- phenylquinoline] ( PQ-S)를 1-[4-(4-amino-3-benzoylphenylsulfanyl)phenyl]ethanone의 Fried1ander 반응에 의해 합성하였으며, IR, NMR, 원소분석을 통해 구조를 확인하였다. PQ-S는 전방향족 화학구조로 인해 235℃의 높은 유리전이온도와 초기분해온도가 513℃인 높은 열안정성을 보였다. PQ-S는 클로로포름이나 테트라클로로에탄과 같은 유기용매에 뛰어난 용해성을 보여 스핀 코팅법에 의해 균일한 박막을 손쉽게 제조할 수 있었다. UV-visible 흡수 및 방출스펙트럼을 통해 PQ-S는 420nm을 최대파장으로 하는 photoluminescence를 보임을 확인하였으며, 또한 대표적인 전자받게인 2,4,7- trinitrofluorenone과의 전하 이동 착체를 형성함을 알 수 있었다.

Keywords: polyquinoline; thermal stability; charge transfer complex; photoluminescence