1. Star-Shaped Oligo(p-phenylenevinylene) Substituted Hexaarylbenzene: Purity, Stability, and Chiral SeIf-assembIy.
- Author
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Tomović, Źeljko, van Dongen, Joost, George, Subi J., Hong Xu, Pisula, Wojciech, LecIère, Philippe, SmuIders, Maarten M. J., De Feyter, Steven, Meijer, E. W., and Schenning, Albertus P. H. J.
- Subjects
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MOLECULES , *MOLECULAR self-assembly , *STABILITY (Mechanics) , *GEL permeation chromatography , *X-rays , *MICROSCOPY - Abstract
An oligo(p-phenylenevinylene) (OPV)-substituted hexaarylbenzene has been synthesized and fully characterized. Recycling gel permeation chromatography appeared to be a powerful technique to obtain the OPV molecules in a very pure form. X-ray analysis and polarization optical microscopy revealed that the OPV molecule is plastic crystalline at room temperature with an ordered columnar superstructure. In apolar solvents, the molecules self-assemble via a highly cooperative fashion into right-handed chiral superstructures, which are stable even at high temperatures and low concentration. Atomic force microscopy revealed right-handed fibers with a diameter of 6 nm, indicating π-stacked aggregates; on a silicon oxide substrate, supercoiled chiral structures were observed. STM studies on a liquid-solid interface showed that the star-shaped OPV molecule forms an organized monolayer having a chiral hexagonal lattice. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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