| Abstract
| - Highly ordered surface layers of two polycyclic aromatic hydrocarbons, dodecylphenyl-substituted hexa-peri-hexabenzocoronene and an extended disk consisting of 96 carbon atoms 6-fold-alkyl-substituted, were obtained by the solution-based zone-casting technique. The structural analysis revealed high macroscopic uniaxial orientation of the columns over large areas in the deposition direction.
- The self-organization of two polycyclic aromatic hydrocarbons with different aromatic core sizes,dodecylphenyl-substituted hexa-peri-hexabenzocoronene and an extended disk consisting of 96 carbonatoms 6-fold-alkyl-substituted, on the surface from solution has been investigated. Highly ordered surfacelayers of both materials could be obtained by the zone-casting technique, despite an apparently lowself-organization in drop-cast films. The zone-cast films revealed high macroscopic uniaxial orientationof the columns with a molecular edge-on arrangement on the glass support as confirmed by polarizedoptical microscopy, UV−vis measurements in polarized light, high-resolution transmission electronmicroscopy, and X-ray diffraction. Electron diffraction indicated a high intracolumnar periodicity of themolecules, but a low intercolumnar correlation of the disks due to the increased molecular dynamics inthe liquid crystalline phase.
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