Synthesis and structural characterization of alkyl oligothiophenes—the first isomerically pure dialkylsexithiophene
摘要:
Regioselective bromination of alkylated bi- and ter-thiophenes affords key building blocks for the synthesis of higher, isomerically pure alkyl oligothiophenes. For all new compounds, unequivocal structural assignment is based on a detailed analysis of the fully coupled C-13, H-1 NMR spectra.
Photoinduced Energy and Electron Transfer in Fullerene−Oligothiophene−Fullerene Triads
作者:Paul A. van Hal、Joop Knol、Bea M. W. Langeveld-Voss、Stefan C. J. Meskers、J. C. Hummelen、René A. J. Janssen
DOI:10.1021/jp0012597
日期:2000.6.1
electron-transfer reaction for n = 6 and 9, but not for n = 3. The lifetime of the charge-separated state in the film is on the order of milliseconds. Photoexcitation of the oligothiophene moiety of the C60−nT−C60 triads, dissolved in an apolar solvent, results in a singlet energy-transfer reaction to the fullerene moiety with rates varying between 1012 and 1013 s-1. In more polarsolvents, an intramolecular photoinduced
Regioselective bromination of alkylated bi- and ter-thiophenes affords key building blocks for the synthesis of higher, isomerically pure alkyl oligothiophenes. For all new compounds, unequivocal structural assignment is based on a detailed analysis of the fully coupled C-13, H-1 NMR spectra.
Substituted 2,2':5',2'':5'',2''':5''',2'''':5'''',2''''': 5''''',2'''''':5'''''',2''''''':5''''''',2'''''''':5'''''''',2''''''''':5''''''''',2''''''''''-undecithiophenes, the longest characterized oligothiophenes
作者:W. Ten Hoeve、H. Wynberg、E. E. Havinga、E. W. Meijer
DOI:10.1021/ja00015a067
日期:1991.7
The title compds. I (n = 3, 11) were prepd. utilizing the Stetter reaction followed by ring closure with Lawesson's reagent. Optical studies and cond. data of doped I together with a series of differently sized oligothiophenes show that at the chain length of 11 thiophene rings the properties closely resemble those of polythiophene. Hence, the min. effective conjugation length in polythiophenes is