Two-Dimensional Surface Chirality Control by Solvent-Induced Helicity Inversion of a Helical Polyacetylene on Graphite

摘要

The development of two-dimensional (2D)chiral surfaces has attracted considerable interest because of possible applications in electrochemical sensors for chiral molecules and enantioselective catalysis and adsorbents for producing and separating chiral molecules,respectively.The supramolecular self-assembly concept has been intensively applied to create 2D chiral surfaces through epitaxial adsorptions and alignments of chiral small molecules on crystalline graphite and metals,as evidenced by scanning probe microscopy (SPM)observations of their enantiomorphic 2D arrangements at the atomic or molecular level.Although biological polymers,such as DNA and proteins,have been utilized to create helical architectures of patterned 2D assembled polymers,it still remains difficult,but a great challenge,to create 2D chiral surfaces using fully synthetic helical polymers on the substrates.