Controlled Self-Assembly Triggered by Olefin Metathesis:Cross-Linked Graphitic Nanotubes from an Amphiphilic Hexa-peri-hexabenzocoronene

摘要

Physical stabilization of self-assembled nano-objects through chemical cross-linking is an important subject for practical applications of supramolecular chemistry.We recently reported that a Gemini-shaped hexa-peri-hexabenzocoronene(HBC)amphiphile 1,bearing two paraffinic long alkyl chains on one side and two triethylene glycol(TEG)chains on the other,self-assembles to give graphitic nanotubes.The nanotubes are formed by helical rolling-up of a bilayer tape consisting of bilaterally coupled columns of jr-stacked HBC units,where the paraffinic side chains are located within the wall,while the hydrophilic TEG chains cover both the inner and outer surfaces of the nanotubes(Figure 1).