HETEROCYCLIC HEPTAMERS CONTAINING THIOPHENE AND PYRROLE UNITS - SYNTHESIS AND PROPERTIES

Studies on septithiophenes are relatively rare compared to the availab le detailed investigations of sexithiophenes. The balance is redressed here by a report of the synthesis, electrochemistry and spectroscopic properties of a new alpha,omega-disubstituted septithiophene and two pyrrole-containing septithiophene analogues. Two different routes are described by which it was attempted to impart solubility in organic so lvents to septithiophenes-one unsuccessful and one successful. Evidenc e of an unusual three-electron transfer process is also presented.