Amplifying Chirality-Induced Spin Selectivity in Helical Covalent Organic Frameworks through Fullerene Encapsulation
Xiaofeng Zhang1, Shiguo Fu1, Lei Jia1
1State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Journal of the American Chemical Society
|July 16, 2025
Summary
Chirality-induced spin selectivity (CISS) in spintronics is enhanced by encapsulating fullerenes in chiral frameworks. This host-guest strategy significantly boosts spin polarization, paving the way for advanced electronic devices.
Area of Science:
- Spintronics and molecular electronics
- Chiral materials science
- Supramolecular chemistry
Background:
- Chirality-induced spin selectivity (CISS) is crucial for spintronics but faces challenges in achieving high, tunable spin polarization.
- Precise engineering of chiral architectures and modulation of spin-orbit interactions are key difficulties.
Purpose of the Study:
- To amplify the CISS effect using a host-guest strategy.
- To investigate fullerene encapsulation within chiral covalent organic frameworks (CCOFs) for enhanced spin polarization.
Main Methods:
- Synthesis of enantiomeric 3D helical chiral covalent organic frameworks (CCOFs).
- Encapsulation of fullerenes (C60 and C70) within CCOFs via in situ self-assembly.
- Characterization using circular dichroism (CD) and magnetic conductive atomic force microscopy (mc-AFM).
Main Results:
- Fullerene@CCOF adducts demonstrated clear chirality transfer with strong Cotton effects.
- Spin polarization in pristine CCOFs (46-50%) was significantly enhanced upon fullerene encapsulation.
- Spin polarization reached 77% with C60 and up to 90% with C70.
Conclusions:
- Host-guest interactions provide a robust platform for modulating CISS in chiral materials.
- Fullerene encapsulation, particularly with C70, effectively amplifies spin polarization.
- This approach offers a promising route for developing advanced spintronic materials and devices.
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