o-Phenylene Octamers as Surface Modifiers for Homeotropic Columnar Ordering of Discotic Liquid Crystals.

Large-area homeotropic columnar ordering of π-conjugated discotic liquid crystals (LCs) is crucial for certain device applications but generally hard to achieve. Here we report polymeric o-phenylene octamer poly-1 and its monomer 1 as the first surface modifiers for homeotropic columnar order of a v...

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Detalles Bibliográficos
Publicado en:	Journal of the American Chemical Society Vol. 135; no. 39; pp. 14564 - 14568
Autores principales:	Kajitani, Takashi, Suna, Yuki, Kosaka, Atsuko, Osawa, Terutsune, Fujikawa, Shigenori, Takata, Masaki, Fukushima, Takanori, Aida, Takuzo
Formato:	Artículo
Publicado:	American Chemical Society 10/2/2013
Materias:	Phenylene compounds Aromatic compounds Discotic liquid crystals Liquid crystals Polymeric composites
Acceso en línea:	Ver este registro en EBSCOhost

Descripción
Sumario:	Large-area homeotropic columnar ordering of π-conjugated discotic liquid crystals (LCs) is crucial for certain device applications but generally hard to achieve. Here we report polymeric o-phenylene octamer poly-1 and its monomer 1 as the first surface modifiers for homeotropic columnar order of a variety of discotic LCs up to a macroscopic length scale. Their octameric ophenylene parts are known to fold helically into a cylinder that is reminiscent of a π-stacked column of discotic LCs. Through-view X-ray diffraction patterns of 1 suggested that this molecule adheres to the glass substrate and directs its cylindrical axis perpendicular to the glass surface. This "face-on" orientation likely nucleates the homeotropic columnar order of discotic LC materials.