Browsing by Author "Schlosser, Hubert"

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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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    Intramolecular energy transfer through linear polyenes : effect of spacers
    (1990) Blessing, Gerd; Holl, Norbert; Port, Helmut; Wolf, Hans Christoph; Effenberger, Franz; Kesmarszky, Thomas; Schlosser, Hubert
    The optical properties of linear polyenes terminally substituted with different molecules (mainly anthryl- and TPP-substituents) have been studied. Bicyclic spacers within the polyene chain affect the quantum yields but do not interrupt intramolecular energy transfer between the endgroups.
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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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    Properties of amphiphilic terminally substituted conjugated nonaene- and 2-docosylnonaene carboxylic acids in monolayers at the air-water interface
    (1991) Effenberger, Franz; Meller, Paul; Ringsdorf, Helmut; Schlosser, Hubert
    In the present communication, we report thesynthesis of conjugated nonaene- and 2-docosylnonaene carboxylic acids with different terminal substituents. These substituents have been chosen so that their spectroscopic properties differ from those of the polyene chain; they also have specific electron donor, electron acceptor or redox properties to allow for specific and selective excitation (energy intake). Because of the amphiphilic character of these compounds, pressure-area isotherms were determined in monolayers at the air-water interface.
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    Synthesen endständig substituierter, konjugierter Polyene
    (1990) Effenberger, Franz; Schlosser, Hubert
    Von besonderem Interesse sind Donor-Acceptor-substituierte Polyene, da sie für einen intramolekularen Energietransport geeignet sein könnten. Zu Beginn unserer Untersuchungen waren Polyene dieses Typs nicht bekannt; inzwischen ist die Darstellung einiger Donor-Acceptor-substituierter, konjugierter Polyene beschrieben worden. Wir berichten hier über die präparativen Aspekte der Herstellung dieser Verbindungen, wobei der Struktur-Zuordnung und der Trennung der - durch die Synthese bedingt - anfallenden EI Z-Isomeren besondere Bedeutung beigemessen wurde.
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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.