| Abstract
| - A series of α,ω-bis(mesitylthio)oligothiophenes of various chain lengths and with different side substitutionpatterns have been studied in their oxidized states by means of electron absorption and Raman spectroscopiesin combination with theory in the framework of the density functional theory. Upon chemical oxidation,stable radical cations, dications, and even radical trications are generated. Longer chain lengths better stabilizehigher oxidation states. The tetramer can be easily converted to the dication, and a trication can be obtainedfor the ethylenedioxy derivative. The α,ω-sulfur atoms are actively involved in the formation of the chargedspecies and exert a favorable tuning of their electronic structure. Raman spectra provide experimental evidenceof the attainment of quinoidal structures within the conjugated path, initially heteroaromatic, with differentextension as a function of the p-doping level.
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