Polyaniline is one of the most studied conjugated polymers, because of the convenience of synthesis and excellent stability in air. In order to elucidating its conducting mechanism, a series of oligomers were synthesized in past. The first oligoaniline, tetramer, was reported in 1907 without comprehensive analysis. In 1968, Honzl reported a synthetic method, which involved the condensation of small oligoanilines (i.e., dimer and trimer) with diethyl succinoylsuccinate, followed by hydrolysis, decarboxylation, and aromatization. By this method, phenyl-capped tetraaniline and hexaaniline were synthesized. In 1986, based on a modified Honzl approach, Wudl and co-workers synthesized a phenyl-capped octamer, which was reported to have essentially the same electronic, electrical and spectroscopic properties as polyaniline.
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