Programmable Helicity and Spin Polarization in Pt6L4 Coordination Capsules through Guest-Mediated Chiral Control

Area of Science:

• Supramolecular Chemistry
• Spin Electronics
• Chiral Materials

Background:

• Controlling spin polarization at the molecular level is crucial for spin filtering.
• 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 controlled 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:

• Successful transfer and inversion of chirality in octahedral capsules.
• Demonstration of chirality-dependent electronic state changes via MCD.
• Independent verification of spin-selective charge transport using mc-AFM.
• Reversible switching of spin polarization achieved by modulating host-guest electronic coupling.

Conclusions:

• Dynamic, chirality-matched host-guest interactions can emulate enzymatic stereochemical control.
• This approach provides a general design principle for chiral coordination architectures with tunable spin functions.
• Offers molecular-level insights into programmable spin control in supramolecular systems.