Photoswitchable Hydrogen-Bonding in Self-Organized Cylindrical Peptide Systems.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Organic Chemistry

Background:

• Photochromic materials offer dynamic control over molecular properties.
• Azobenzene derivatives are widely used in photoresponsive systems.
• Supramolecular self-assembly enables the creation of complex architectures.

Purpose of the Study:

• To develop a novel photochromic supramolecular system based on azobenzene and cyclic peptides.
• To investigate the reversible switching between inter- and intramolecularly assembled structures.
• To explore the photoinduced E→Z isomerization behavior of the system.

Main Methods:

• Synthesis of an azobenzene derivative functionalized with cyclic peptides.
• Characterization of self-assembly in solution using spectroscopic techniques.
• Analysis of thin films at the air-water interface.
• Investigation of photoisomerization using UV-Vis spectroscopy.

Main Results:

• The system successfully self-assembles into cylindrical β-sheet structures.
• Reversible switching between intermolecular and intramolecular assembly was achieved upon light irradiation.
• Quantitative photoinduced E→Z isomerization of the azobenzene moiety was observed.
• The system demonstrated stability in both solution and thin film states.

Conclusions:

• The developed photochromic supramolecular system provides a platform for light-controlled self-assembly.
• The quantitative E→Z isomerization is a significant advancement in photoresponsive materials.
• This system holds potential for applications in smart materials and molecular devices.