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Constructive quantum interference in a bis-copper six-porphyrin nanoring.

Sabine Richert1, Jonathan Cremers2, Ilya Kuprov3

  • 1Centre for Advanced Electron Spin Resonance (CAESR), Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK.

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Summary

We measured quantum interference in copper nanorings using electron paramagnetic resonance spectroscopy. Constructive interference significantly boosted exchange coupling, demonstrating enhanced through-bond electronic communication.

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Area of Science:

  • Quantum chemistry
  • Molecular magnetism
  • Spectroscopy

Background:

  • Exchange interaction (J) quantifies through-bond electronic communication between spin centers.
  • Quantum interference phenomena can influence electronic communication pathways.
  • Porphyrin nanorings offer a platform to study molecular interactions.

Purpose of the Study:

  • Investigate quantum interference in a bis-copper six-porphyrin nanoring.
  • Quantify the exchange coupling (J) between copper centers using electron paramagnetic resonance (EPR) spectroscopy.
  • Analyze the impact of molecular structure on electronic communication.

Main Methods:

  • Utilized electron paramagnetic resonance (EPR) spectroscopy.
  • Performed double electron electron resonance (DEER) experiments.
  • Employed analytical simulations incorporating dipolar and exchange coupling.

Main Results:

  • Precisely quantified exchange coupling (J) between copper centers.
  • Demonstrated high-precision J measurement even with significant through-space coupling.
  • Observed a 4.5-fold increase in exchange coupling in a bis-copper nanoring with two coupling paths compared to one.

Conclusions:

  • The study confirms constructive quantum interference in the bis-copper nanoring system.
  • Enhanced exchange coupling is a direct signature of constructive quantum interference.
  • This work highlights the role of quantum interference in modulating electronic communication in molecular systems.