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Researchers developed novel organic diradicals with an inverted singlet-triplet (InveST) energy gap. Photoexcitation enables optical control of spin polarization, paving the way for molecular quantum technologies.

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Area of Science:

  • Molecular Chemistry
  • Quantum Technologies
  • Organic Electronics

Background:

  • Molecular platforms offer advantages over solid-state spin centers for optically addressable spin states.
  • Scalable synthesis, structural tunability, and chemical versatility are key features of molecular spin systems.

Purpose of the Study:

  • To present a molecular design strategy for photoinduced spin polarization in organic diradicals.
  • To explore the use of inverted singlet-triplet (InveST) energy gap systems for optical-spin interfaces.

Main Methods:

  • Design of organic diradicals bridged by InveST units.
  • Covalent linking of hydrocarbon radicals to the LUMO-localized atoms of the InveST bridge.
  • Utilizing model Hamiltonians and multireference ab initio calculations.

Main Results:

  • Constructed diradicals with electronically decoupled radical centers in the ground state.
  • Achieved photoinduced spin polarization via excited-state exchange interaction upon photoexcitation.
  • Demonstrated molecular-level control over optical-spin interfaces by tuning exchange interactions and spin-orbit coupling.

Conclusions:

  • InveST-bridged diradicals are promising scaffolds for molecular quantum technologies.
  • The developed strategy enables precise control over spin polarization through optical addressing.
  • This work advances the development of novel molecular materials for quantum applications.