08 Fakultät Mathematik und Physik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/9
Browse
2 results
Search Results
Item Open Access Dual fluorescence of 9-anthryl-substituted oligothiophenes in nonpolar environment(1994) Emele, Peter; Meyer, Dirk U.; Holl, Norbert; Port, Helmut; Wolf, Hans Christoph; Würthner, Frank; Bäuerle, Peter; Effenberger, Franz9-Anthryl-oligothiophenes (9A-Tn, n = 1–4) have been studied in n-hexane solution between helium and room temperature using absorption, fluorescence emission and excitation spectra and time resolved fluorescence measurements. These compounds are reference systems for studies on intramolecular energy and charge transfer in donor/acceptor-substituted conjugated chain molecules. The absorption spectra show contribution of both substituents anthracene and oligothiophene, but no additional bands due to mixed electronic states. Dual fluorescence is observed at Tgreater-or-equal, slanted 120 K for the compounds 9A-Tn (n = 1–3), but not for 9A-T4. Time resolved spectroscopy reveals a dynamical coupling between the two emission components whose relative quantum yields are strongly temperature dependent. The occurrence of the dual fluorescence is explained by an intramolecular torsional motion between the two molecular subunits.Item Open Access Synthesis and optical properties of terminally substituted conjugated polyenes(1988) Effenberger, Franz; Schlosser, Hubert; Bäuerle, Peter; Maier, Stefan; Port, Helmut; Wolf, Hans ChristophLong-chain, conjugated polyenes can function as molecular wires. This is shown by the photophysical properties of polyenes containing naphthyl, anthryl, and tetraphenylporphyrinyl (TPP) terminal groups. When the anthryl group in 1, which is obtainable by a sequence of Wittig reactions, is selectively excited, strong TPP emission is observed.