Supramolecular Rods Research Articles

Chain Architecture Dependent 3‐Dimensional Supramolecular Assembly of Rod‐Coil Molecules with a Conjugated Hexa‐p‐phenylene Rod

AbstractSummary: We have prepared hexa‐p‐phenylene based rod‐coil molecules with identical coil volume fractions, but different poly(propylene oxide) (PPO) coil architectures (linear versus dibranched), and investigated their self‐assembling behavior in the solid state by small angle X‐ray scattering (SAXS) and transmission electron microscopy (TEM) techniques. Rod‐coil molecules with a linear PPO coil showed a honeycomb‐like lamellar assembly of rod segments with hexagonally arrayed PPO coil perforations. In contrast, the rod‐coil molecules with dibranched PPO coils self‐organized into rod bundles with a body centered tetragonal symmetry surrounded by a PPO coil matrix. These results demonstrate that the steric hindrance at the rod/coil interface arising from coil architectural variation is a dominant parameter governing supramolecular rod assembly in the rod‐coil system.TEM images and schematic illustrations of the self‐assembled structures of rod‐coil molecules with linear (left) and dibranched (right) PPO coils, respectively.imageTEM images and schematic illustrations of the self‐assembled structures of rod‐coil molecules with linear (left) and dibranched (right) PPO coils, respectively.

Formation of [60]Fullerene Nanoclusters with Controlled Size and Morphology through the Aid of Supramolecular Rod–Coil Diblock Copolymers

Am Startblock: Polystyrol-block-poly(4-vinylpyridin) und eine [60]Fullerencarbonsäure bilden zusammen sphärische supramolekulare Aggregate (siehe Bild), deren Größe und Morphologie über das Verhältnis der Blöcke im Copolymer gesteuert werden kann. Das Verfahren eignet sich generell für den Aufbau organischer Nanopartikel. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2005/z461174_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.

Formation of [60]Fullerene Nanoclusters with Controlled Size and Morphology through the Aid of Supramolecular Rod–Coil Diblock Copolymers

Formation of [60]Fullerene Nanoclusters with Controlled Size and Morphology through the Aid of Supramolecular Rod–Coil Diblock Copolymers

Hydrogen-Bonding-Mediated Formation of Supramolecular Rod−Coil Copolymers Exhibiting Hexagonal Columnar and Bicontinuous Cubic Liquid Crystalline Assemblies

The preparation and characterization of the supramolecular rod−coil copolymers directed by molecular recognition of 4,4‘-bipyridine and 4-[poly(propyleneoxy)propyloxy]-4‘-bis(biphenyl carboxylic acid) with degrees of polymerization (DP) of poly(propylene oxide) coil of eight (P-8-HP), 10 (P-10-HP), 15 (P-15-HP), 17 (P-17-HP), 21 (P-21-HP), 27 (P-27-HP) and 34 (P-34-HP) are described. The introduction of poly(propylene oxide) (PPO) coils with different lengths into the rodlike polymeric system induces a rich variety of self-assembled microstructures. In the crystalline phase, the supramolecular rod−coil copolymers with DP of PPO 8−17 organize into a microphase-separated monolayer lamellar structure. In contrast, the supramolecular rod−coil copolymers with DP of PPO 21−34 exhibit a hexagonal columnar crystalline phase. A dramatic phase change after crystalline melting of the polymers is observed with the variation of the coil length. The supramolecular rod−coil copolymers P-8-HP and P-10-HP display a bicontinuous cubic mesophase with Ia3d symmetry, while the supramolecular rod−coil copolymers P-15-HP, P-17-HP, and P-21-HP with a medium length of PPO coil exhibit a hexagonal columnar mesophase. Further increasing the length of coil, as in the case of P-27-HP and P-34-HP, suppresses liquid crystallinity and induces only crystalline polymers.