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A Motor-Integrated Three-Dimensional Covalent Organic Framework with Dual-Mode Functionality.

Junxia Ren1, Yujie Wang2,3, Jinquan Suo1

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Researchers created a new material by embedding molecular motors into covalent organic frameworks (COFs). This innovation enables light-controlled carbon dioxide capture and drug delivery, bridging molecular motion to macroscopic functions.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Biological systems utilize molecular machines within scaffolds for macroscopic functions.
  • Synthetic replication requires integrating molecular motors into dynamic, ordered frameworks.

Purpose of the Study:

  • To develop a reticular design strategy for incorporating overcrowded alkene rotary motors into 3D covalent organic frameworks (COFs).
  • To create a prototype material (JUC-666) demonstrating coordinated molecular motion and macroscopic functionality.

Main Methods:

  • Reticular synthesis of 3D covalent organic frameworks (COFs) incorporating overcrowded alkene rotary motors.
  • Spectroscopic and kinetic analyses to confirm unidirectional motor rotation in solution and solid states.
  • Evaluation of CO2 uptake modulation and light-controlled drug release functionalities.

Main Results:

  • Successful incorporation of rotary motors into a 3D COF (JUC-666) exhibiting unidirectional rotation.
  • Demonstrated reversible CO2 uptake modulation (>83% capacity variation at 273 K) via light-dark cycling.
  • Achieved precisely controlled drug release with light-dosage-proportional kinetics (∼50-fold increase in cumulative release).

Conclusions:

  • Covalent organic frameworks (COFs) can effectively bridge molecular-scale motion to macroscopic responses.
  • JUC-666 serves as a platform for designing adaptive functional materials with dual-mode capabilities.
  • This approach enables the development of materials responsive to external stimuli like light.