Uniaxial alignment of poly cyclic aromatic hydrocarbons by solution processing

Wojciech Pisula, Zeljko Tomović, Michael Stepputat, Ute Kolb, Tadeusz Pakula, Klaus Müllen

Research output: Contribution to journalArticleAcademicpeer-review

69 Citations (Scopus)

Abstract

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 carbon atoms 6-fold-alkyl-substituted, on the surface from solution has been investigated. Highly ordered surface layers of both materials could be obtained by the zone-casting technique, despite an apparently low self-organization in drop-cast films. The zone-cast films revealed high macroscopic uniaxial orientation of the columns with a molecular edge-on arrangement on the glass support as confirmed by polarized optical microscopy, UV-vis measurements in polarized light, high-resolution transmission electron microscopy, and X-ray diffraction. Electron diffraction indicated a high intracolumnar periodicity of the molecules, but a low intercolumnar correlation of the disks due to the increased molecular dynamics in the liquid crystalline phase.

Original languageEnglish
Pages (from-to)2641-2647
Number of pages7
JournalChemistry of Materials
Volume17
Issue number10
DOIs
Publication statusPublished - 17 May 2005

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