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Abstract:
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This work has studied sulfur-containing heterocycles, with the emphasis on the Tetrathiafulvale and the a-Oligothiophenes. Several compounds were prepared and described. During the thesis, few questions were raised and finally, all of them can be sufficiently explained. The big red Stokes-shift in fluorescence spectra compared to absorption maxima is due to increasing conjugation length of the p-electronicsystem, resulting in a lowering of the HOMO-LUMO gap. The phenomenon of unexpected disappearing of the peak maximum in solid samples compared to the solution spectrum indicates that the considerable blue-shift takes place because of the reduction of planarity, due to substituted stilben unit. /Kir10 |