OPTICAL-PROPERTIES OF OLIGOTHIOPHENE INCLUSION-COMPOUNDS

Single quasi-planar thiophene oligomers, electronically decoupled in t he solid state, are obtained by inclusion of the molecules in pehydrot riphenylene. The suppression of the collective excitations, which domi nate the optical properties of aggregated oligothiophenes, evidences t he spectroscopical properties of the single molecules. The radiative r ecombination process takes place from two emitting states, separated b y a small potential barrier. The conformational mobility ensured by th e cylindrical channels of the host compound, allows torsional relaxati on in the excited state even at low temperatures.