Synthesis and properties of hexyl-substituted oligothiophenes

Sexi-, novi-, duodeci-, and quindeci-thiophenes with hexyl groups were prepared by a reductive coupling reaction of dibromodihexylterthiophene with an activated nickel(0) reagent and purified by liquid chromatography. The obtained oligothiophenes were identified by 1H-NMR spectroscopy, elemental analysis, and GPC. The absorption spectra of the oligothiophenes in solution and in solid were investigated.