OLIGOTHIOPHENES - YET LONGER - SYNTHESIS, CHARACTERIZATION, AND SCANNING-TUNNELING-MICROSCOPY IMAGES OF HOMOLOGOUS, ISOMERICALLY PURE OLIGO(ALKYLTHIOPHENE)S

Sixteen thiophene units make up the longest oligothiophene to date, the 64 Å‐long oligomer 4. Like its shorter homologues 1–3, 4 forms molecular structures on surfaces, which can be examined by scanning tunneling microscopy with submolecular resolution. Oligomers 1‐4 can be considered components of “molecular wires” and serve as model compounds for the study of charge transport in electrically conducting polymers. (Figure Presented.) Copyright © 1995 by VCH Verlagsgesellschaft mbH, Germany