Side-Chain-Driven Dual Structural System of Poly-Arylopeptide: Selective Helical Formation Derived from Aromatic Ring...

Area of Science:

• Polymer Chemistry
• Macromolecular Science
• Organic Chemistry

Background:

• Previous work introduced poly(arylopeptide)s with aromatic rings on the peptide backbone.
• Axially unsymmetrical aromatic rings are key for creating novel macromolecular structures.

Purpose of the Study:

• To present a methodology for producing dual structural systems of macromolecules.
• To utilize 2,6-naphthalene rings as unsymmetrical spacers to create dual structural properties in poly(arylopeptide)s.

Main Methods:

• Incorporation of 2,6-naphthalene units into the polypeptide backbone.
• Exploitation of the energy difference between anti and syn geometrical isomers of the naphthalene rings.
• Induction of conformational conversion between 3₁-helix and 4₁-helix structures.

Main Results:

• Demonstrated the creation of dual structural properties in poly(arylopeptide)s using 2,6-naphthalene spacers.
• Showcased the amplification of minuscule energy differences between isomers to form specific global structures (3₁-helix or 4₁-helix).
• Achieved a switchable conformational conversion from 3₁-helix to 4₁-helix upon addition of additives.

Conclusions:

• Developed dual helical systems based on molecular geometry principles.
• The systems offer a versatile design platform for synthetic polymers.
• Demonstrated control over macromolecular structure through precise molecular design.