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Ethynylene‐Linked Oligomers Based on Benzodithiophene: Synthesis and Photoelectric Properties
Author(s) -
Jiang Songyang,
Ma Yuwen,
Wang Yingyi,
Wang Chengyun,
Shen Yongjia
Publication year - 2014
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201400079
Subject(s) - chemistry , carbazole , sonogashira coupling , cyclic voltammetry , polymerization , electrochemistry , polymer chemistry , band gap , photochemistry , conjugated system , doping , polymer , organic chemistry , palladium , electrode , optoelectronics , physics , catalysis
Two conjugated ethynyl‐linked oligomers, oligo(benzodithiophene‐ethynylene‐benzothiadiazole) (O1) and oligo(benzodithiophene‐ethynylene‐carbazole) (O2), were synthesized by Sonogashira coupling reaction. Their degrees of polymerization were 7 and 10, respectively. Their photophysical and electrochemical properties were investigated. O1 exhibitd two strong absorption bands at 404 nm and 483 nm, and O2 at 401 nm and 429 nm. The results of UV‐Vis, cyclic voltammetry (CV) and theoretical calculations showed that O1 has a narrower band gap than O2. The conductivities of O1 and O2 were 1.05×10 −15 and 6.98×10 −16 S/cm, respectively, and would increase to 1.23×10 −10 and 1.05×10 −10 S/cm after doping with iodine.