Hilfe Wegweiser Datenschutzhinweis Impressum Kontakt





Liquid crystalline graphite molecules as materials of molecular electronics : versatile synthesis and self-assembly


Wu,  Jishan
MPI for Polymer Research, Max Planck Society;

Externe Ressourcen
Es sind keine Externen Ressourcen verfügbar
Volltexte (frei zugänglich)
Es sind keine frei zugänglichen Volltexte verfügbar
Ergänzendes Material (frei zugänglich)
Es sind keine frei zugänglichen Ergänzenden Materialien verfügbar

Wu, J. (2004). Liquid crystalline graphite molecules as materials of molecular electronics: versatile synthesis and self-assembly. PhD Thesis, Johannes Gutenberg-Universität, Mainz.

Abstract This thesis present the synthesis and self-assembly of a kind of discotic liquid crystalline graphite molecules and their potential applications as materials in molecular electronics. In detail, 1) A new synthetic concept was developed. Several insoluble hexa-peri-hexabenzocoronene (HBC) building blocks were synthesized and the subsequent functionalizations by transition-metal catalyzed coupling reactions lead to a versatile synthesis of HBC materials with multifunctionalities. For example, a series of soluble, highly ordered liquid crystalline materials were synthesized and well-characterized by X-ray scattering, polarized optical microscopy and atomic force microscopy. Electro-active moieties such as hole transporting triarylamines were attached to the HBC cores to give a new “coaxial” hole transport materials with high charge carrier mobilities. Intramolecular charge transfer and intermolecular association of the mixed valence HBCs substituted by arylamine were observed by UV-vis-NIR and ESR techniques. 2) The controlled self-assembly of HBC in solution were studied. A series of alkyl- or polyphenylene dendrons substituted HBCs was synthesized and their self-association behavior in solution was studied by NMR techniques and quantum chemical calculations. An interesting monomer-dimer equilibrium was found in one of the polyphenylene dendrons-substituted HBCs. 3) The synthesis, photophysical properties and self-assembly behavior of the oligomers of HBC with different length and connection modes was presented. Electronic decoupling was observed in the oligomers. The self-assembly behavior in the bulk-state was studied by X-ray diffraction techniques. 4) One-dimensional graphite ribbons were synthesized from the branched polyphenylenes by oxidative cyclodehydrogenation. The insoluble materials were characterized by UV-vis, Raman spectroscopy and transmission electronic microscopy.