Browsing by Author "Ringsdorf, Helmut"

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    Donor-acceptor substituted polyenes : orientation in mono- and multilayers
    (1992) Bubeck, Christoph; Effenberger, Franz; Häußling, Lukas; Neher, Dieter; Niesert, Claus-Peter; Ringsdorf, Helmut
    Large molecules containing different chemical units whose interactions within the molecule result in new macroscopically observable effects, have become increasingly important.The organization of molecules of this type in ordered structures leads to functional molecular materials.Their use in molecular electronics requires that the units exhibit specific electronic properties. Recently, we reported on the intramolecular energy transfer through terminally substituted conjugated polyenes. An intramolecular electron transfer within donor-acceptor substituted polyenes can be achieved by introducing suitable terminal groups.
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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.