Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (04): 459-465.doi: 10.1016/S1872-1508(07)60030-8

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Photophysical Properties and Electropolymerization of Regioregular Head-to-Tail Oligothiophenes-Functionalized 9,9'-spirobifluorene Derivatives

JIN Wei-Hong; NI Jing; LAI Yee-Hing; PEI Jian   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; Institute of Materials Research and Engineering, and Department of Chemistry, National University of Singapore, Singapore 117602, Singapore; College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316004, Zhejiang Province, P. R. China
  • Received:2006-11-13 Revised:2006-12-11 Published:2007-04-05
  • Contact: PEI Jian E-mail:jianpei@pku.edu.cn

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Abstract: The photophysical properties of oligothiophenes-functionalized 9,9'-spirobifluorene derivatives in solution and in solid state were investigated in detail. The enhanced red-shift was observed from the absorption and the photoluminescence (PL) spectra of these derivatives in dilute THF solution with the increase of thiophene unit at one branch of 9,9'-spirobifluorene identical with the increased π-electron delocalization and the more effective conjugation length of the whole molecular system. The investigation of the photophysical properties of these compounds further demonstrated that the sp3-hybrid carbon at the spiro-center completely obstructed the correlation between two branches of the 9,9'-spirobifluorene system and made every branch become an independent chromophore. The electrochemical polymerization of 6b as a representative was also investigated.

Key words: Oligothiophene, 9,9-Spirobifluorene, Photophysical property, Electrochemical polymerization

MSC2000: 

  • O644