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Propeller-Shaped Blatter-Based Triradicals: Distortion-Free Triangular Spin System and Spin-State-Dependent

Takero Aoki1, Hikaru Sotome2, Daiki Shimizu1

  • 1Department of Synthetic Chemistry and Biological Chemistry Graduate School of Engineering, Kyoto University Nishikyo-ku, Kyoto, 615-8510, Japan.

Angewandte Chemie (International Ed. in English)
|November 18, 2024
PubMed
Summary

We synthesized stable triptycene-based triradicals exhibiting unique magnetic properties. These molecules show spin-state-dependent near-infrared absorption and distinct charge transfer behaviors, paving the way for new materials.

Keywords:
EPR spectroscopySQUID magnetometryspin frustrationstable radicalstriradicals

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Quantum Chemistry

Background:

  • Triptycene derivatives offer unique three-dimensional scaffolds for molecular design.
  • Stable organic radicals are of interest for molecular electronics and spintronics.
  • Controlling spin states in molecular systems is crucial for advanced functionalities.

Purpose of the Study:

  • To synthesize and characterize novel triptycene-based C3v- and Cs-symmetric stable triradicals.
  • To investigate the magnetic properties and spin-spin interactions of these triradicals.
  • To explore the relationship between spin states and optical/electronic properties.

Main Methods:

  • Synthesis of triptycene-based triradicals.
  • Superconducting Quantum Interference Device (SQUID) magnetometry for magnetic characterization.
  • Variable-temperature spectroscopic studies and quantum chemical calculations.

Main Results:

  • The propeller-shaped triradicals exhibited an antiferromagnetic equilateral triangle spin system with small spin-spin interactions (J/kB ≈ -120 K and -106 K).
  • A coexistence of doublet and quartet spin states (approx. 4/6 ratio) was observed at room temperature.
  • Characteristic near-infrared absorption bands up to 1000 nm were observed, attributed to the doublet spin state.
  • Spin-state-dependent charge transfer phenomena were identified: low-spin states underwent symmetry-breaking charge transfer, while high-spin states transitioned to a monoradical-like excited state.

Conclusions:

  • The synthesized triptycene triradicals possess tunable magnetic properties and distinct spin-state-dependent optical behaviors.
  • The spin-specific near-infrared absorption provides a method to differentiate between spin states.
  • These findings open avenues for designing functional molecular materials based on controlled spin states and charge transfer.