Tuning the Supramolecular Chirality of Polyaniline by Methyl Substitution

摘要

The formation of structures that have a controlled helicity continues to be a challenging area in the field of polymer and supramolecular chemistry. Driven by the chirality of the composing unit, one may obtain a specific handedness in a helical conformation (right-handed, P, or left-handed, M) in biological or synthetic macromolecules,while helical supramolecular structures can be obtained through intermolecular it-stacking interactions. Interestingly, certain macromole-cules and supramolecular aggregates can change their helicity between P and M in a so-called helix-helix transition by introducing an external stimulus such as light, temperature,solvent, and chiral additives. However, the great majority of the studies on helical inversion were carried out in solution. Since device-oriented applications should be based on materials in the solid state,the study of the helical inversion of nanostructures is of great importance for their potential applications.