Von "chiralen" Superhelices zu achiralen Nanostrukturen spektroskopische und strukturelle Untersuchungen von J-Aggregaten achiraler Cyaninfarbstoffe

by Ouart, André

Abstract (Summary)
In this work spectroscopic and structural investigations were performed on chiral and achiral supramolecular nanoarchitectures of J-aggregates of achiral cyanine dyes. Tetrachlorobenzimidacarbocyanine dyes with different 1,1´-Dialkyl- and 3,3´-Bis-acidoalkyl- substituents were used as model systems. To characterize these nanoarchitectures static spectroscopic methods - UV/vis-spectroscopy, circular dichroism (CD)- and fluorescence-spectroscopy -, x-ray crystal structure analysis, as well as cryogenic transmission electron microscopy (cryo-TEM) were used. The delicate balance of intermolecular forces, like hydrophobic interaction, dispersion forces, as well as hydrogen bonds, leads by J-aggregation of structural similar achiral chromophores to "chiral" superhelices and achiral nanoscopic ribbons. By combination of the hydrophobic and hydrophilic properties of surfactants with the unique properties of J-aggregates nanotubules and vesicles are built. These nanostructures are hopeful candidates for artificial antenna and light harvesting systems.
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Bibliographical Information:


School:Humboldt-Universität zu Berlin

School Location:Germany

Source Type:Master's Thesis

Keywords:J-Aggregate Cyaninfarbstoffe supramolekulare Nanoarchitekturen J-aggregates cyanine dyes supramolecular nanoarchitectures artificial antenna and lightharvesting systems


Date of Publication:09/28/2000

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