Uniaxial Alignment of Polycyclic Aromatic Hydrocarbons by Solution Processing

Autor:	Wojciech Pisula, Ute Kolb, Klaus Müllen, Tadeusz Pakula, Michael Stepputat, Zeljko Tomovic
Přispěvatelé:	Macromolecular and Organic Chemistry
Rok vydání:	2005
Předmět:	Diffraction Materials science General Chemical Engineering Analytical chemistry chemistry.chemical_element General Chemistry law.invention Molecular dynamics chemistry Optical microscope Electron diffraction Transmission electron microscopy law Phase (matter) Materials Chemistry Molecule Carbon
Zdroj:	Chemistry of Materials, 17(10), 2641-2647. American Chemical Society
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm050008d
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13e71c1e0b5e58199cbb37a03c615553 https://doi.org/10.1021/cm050008d Zobrazit plný text záznamu