Molecular motor-functionalized porphyrin macrocycles.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Organic Chemistry

Background:

• Molecular motors and switches respond to external stimuli like light, enabling adaptive materials and switchable catalysts.
• Porphyrin macrocycles are versatile platforms for constructing complex molecular architectures.

Purpose of the Study:

• To design and synthesize novel molecular motor-functionalized porphyrin macrocycles for photo-switchable catalysis.
• To investigate the binding and threading capabilities of these systems with viologen guests, including polymers.

Main Methods:

• Synthesis of diastereomeric molecular motor-porphyrin macrocycles with defined chirality.
• Spectroscopic characterization using Fluorescence, UV-vis, and 1H NMR.
• Binding and threading studies with various viologen guests, including a polymeric variant.

Main Results:

• The synthesized macrocycles exhibit helical, planar, and point chirality.
• Demonstrated ability to bind and thread diverse viologen guests, including a 30-unit polymer.
• Evidence of motor systems finding the open end of a polymer, threading, and moving to a viologen trap.

Conclusions:

• The developed molecular motor-porphyrin systems are promising candidates for future photo-switchable catalysis.
• The ability to interact with and navigate polymer chains opens avenues for 'catalytic writing' on single polymers.