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Programmable Helicity and Spin Polarization in Pt6L4 Coordination Capsules through Guest-Mediated Chiral Control
Zhong Wei1, Xu Jing2, Junkai Cai1
1State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing210023, China.
Researchers achieved programmable spin control in molecules using a chiral-directing strategy. This method reversibly switches spin polarization in supramolecular systems by modulating capsule helicity through host-guest interactions.
Area of Science:
- Supramolecular Chemistry
- Molecular Spintronics
- Chiral Materials Science
Background:
- Controlling spin polarization at the molecular level is key for advanced electronics.
- Reversible sign control of spin polarization in supramolecular systems is a significant challenge.
Purpose of the Study:
- To develop a strategy for programmable and reversible control of chirality-induced spin selectivity (CISS).
- To investigate the modulation of helical states in octahedral capsules for spin control.
Main Methods:
- Chiral-directing strategy using (R)-1,1'-bi-2-naphthol to induce capsule helicity.
- Host-guest interactions with (R)-1,1'-binaphthyl-2,2'-diylhydrogen phosphate for helicity inversion.
- Magnetic circular dichroism (MCD) for electronic state analysis.
- Magnetic conductive atomic force microscopy (mc-AFM) for spin-selective charge transport evaluation.
Main Results:
- Demonstrated programmable and reversible control of CISS by modulating capsule helicity.
- Successfully transferred and inverted chirality in octahedral capsules via host-guest interactions.
- Confirmed chirality-dependent electronic changes and spin-selective charge transport.
Conclusions:
- Dynamic, chirality-matched host-guest interactions can emulate enzymatic stereochemical control.
- Provides a general design principle for chiral coordination architectures with tunable spin functions.
- Offers molecular-level insights into programmable spin control in supramolecular systems.
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