Stepped Strips From Self-organization Of Oligo(p-phenylene) Rods Withrnlateral Dendritic Chains

摘要

The design of novel self-assembling molecules offers an opportunity to extend our understanding how to create unique supramolecular structures with desired functions. Diverse self-assembling molecules including dendrimers, liquid crystals, and block copolymers are being created as a means of manipulating aggregation structure. Incorporation of a stiff rodlike building block into a block molecular architecture is particularly attractive for generating highly defined self-assembled structures that have physical dimensions as small as a few nanometers. In addition to the conventional layered structures, the rod building blocks self-assemble into a wide variety of complex geometries, including perforated layers, columns, and bundles, through covalent attachment of long flexible chains to their distal part. Increasing volume fraction of coil segments drives the layers to break up into smaller domains including columns in which the rods are arranged perpendicular to the column axis. Previously, we have shown that the macrocyclic attachment of a flexible chain into both ends of a rod frustrates the formation of two-dimensional layers commonly observed for linear rod-coil molecules.