Browsing by Author "Maier, Stefan"

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    Energy transfer through conjugated polyenes
    (1989) Maier, Stefan; Port, Helmut; Wolf, Hans Christoph; Effenberger, Franz; Schlosser, Hubert
    From an analysis of absorption, fluorescence and excitation spectra of linear polyene molecules with 4 to 13 double bonds and one or two aromatic substituents at the chain ends we conclude that the aromatic substituents can be excited individually, and that intramolecular energy transfer from one end group via the polyene to the other end group is possible.
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    Localized states in anthrylpolyenes : influence of geometry
    (1990) Heine, Barbara; Sigmund, Ernst; Maier, Stefan; Port, Helmut; Wolf, Hans Christoph; Effenberger, Franz; Schlosser, Hubert
    Combining group theoretical arguments and (extended) Hückel calculations, it is shown that terminally anthryl-substituted polyenes exhibit states almost completely localized at the substituents. These localized states are related to characteristic optical transitions in anthracene which also are observed in anthrylpolyenes independent of the length of the polyene chain.
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    Synthesen und optische Eigenschaften endständig substituierter konjugierter Polyene
    (1988) Effenberger, Franz; Schlosser, Hubert; Bäuerle, Peter; Maier, Stefan; Port, Helmut; Wolf, Hans Christoph
    Wir berichten hier über die Synthese konjugierter Polyene unterschiedlicher Länge, die endständig Substituenten tragen, deren spektroskopische Eigenschaften sich von denen der Polyenkette unterscheiden. Anhand von Absorptions-, Emissions- und Anregungsspektren werden die gezielte optische Anregung dieser Modellverbindungen und die Möglichkeiten eines intramolekularen Energietransports diskutiert.
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    Synthesis and optical properties of terminally substituted conjugated polyenes
    (1988) Effenberger, Franz; Schlosser, Hubert; Bäuerle, Peter; Maier, Stefan; Port, Helmut; Wolf, Hans Christoph
    Long-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.