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Keywords:

  • cations;
  • conductivity;
  • oligomers;
  • radicals;
  • thiophene

Abstract

Sterically unprotected thiophene/phenylene co-oligomer radical cation salts BPnT.+[Al(ORF)4] (ORF=OC(CF3)3, n=1–3) have been successfully synthesized. These newly synthesized salts have been characterized by UV/Vis-NIR absorption and EPR spectroscopy, and single-crystal X-ray diffraction analysis. Their conductivity increases with chain length. The formed meso-helical stacking by cross-overlapping radical cations of BP2T.+ is distinct from previously reported face-to-face overlaps of sterically protected (co-)oligomer radical cations.

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