title: Shape-persistent macrocycles with intraannular polar groups: synthesis, liquid crystallinity, and 2D organization.
abstract: The synthesis of macrocycles with intraannular polar ester groups and extraannular oligo-alkyl groups is described. The compounds exhibit stable liquid crystalline phases showing fan-shaped textures under the polarizing microscope, typical for a columnar order of the molecules. X-ray powder diffraction data of the LC phase indicate that the unit cell contains two symmetry-related units, a feature pointing most probably to a restricted rotation of the macrocycles within a stack. The X-ray data were further supported by solid-state NMR experiments, showing that the rigid core of the compounds does not rotate with kHz or higher frequencies within the column in the LC phase. Apart from the organization of the molecules in the LC phase, the 2D organization of the macrocycles at the solvent-highly oriented pyrolytic graphite (HOPG) interface was investigated and showed that these compounds are capable of nanofunctionalizing the HOPG surface in the multinanometer regime.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Fischer
authors.forename: Günter
authors.initials: G
authors.lastname: Lieser
authors.forename: Almut
authors.initials: A
authors.lastname: Rapp
authors.forename: Ingo
authors.initials: I
authors.lastname: Schnell
authors.forename: Wael
authors.initials: W
authors.lastname: Mamdouh
authors.forename: Steven
authors.initials: S
authors.lastname: De Feyter
authors.forename: Frans C
authors.initials: FC
authors.lastname: De Schryver
authors.forename: Sigurd
authors.initials: S
authors.lastname: Höger