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Nuclear hyperpolarization in electron transfer in chiral systems.

Tatyana V Leshina1, Nikolay E Polyakov1, Ilya M Magin1

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Chiral-induced spin selectivity (CISS) influences electron transfer (ET). Nuclear spin selectivity (NSS) in chiral systems reveals mechanisms beyond radical pair theory, potentially linking electron and nuclear spin behaviors.

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Area of Science:

  • Physical Chemistry
  • Quantum Information Science
  • Spintronics

Background:

  • Electron transfer (ET) is fundamental to chemical, biological, and physical processes.
  • Electron spins are crucial for spintronics and quantum information science.
  • Chiral-induced electron spin selectivity (CISS) offers novel control over electron spin dynamics.

Purpose of the Study:

  • To investigate the physical mechanisms of chiral centers influencing electron movement.
  • To study photoinduced electron transfer (PET) in chiral donor-acceptor dyads as a model system.
  • To explore nuclear spin selectivity (NSS) in chiral systems.

Main Methods:

  • Utilizing photoinduced electron transfer (PET) in chiral donor-acceptor dyads.
  • Analyzing chemically induced dynamic nuclear polarization (CIDNP) effects.
  • Comparing NSS in chiral dyads with different optical orientations in solutions.

Main Results:

  • Observed differences in chemically induced dynamic nuclear polarization (CIDNP) effects in chiral dyads.
  • Demonstrated that nuclear spin selectivity (NSS) in nuclear hyperpolarization is not fully explained by radical pair theory.
  • Identified a potential link between the spin selectivity of electrons and nuclei.

Conclusions:

  • The established theory of radical pairs does not fully account for observed nuclear spin selectivity (NSS).
  • A novel hypothesis suggests a connection between electron spin selectivity and nuclear spin selectivity.
  • Further research is needed to elucidate the physical mechanisms governing spin selectivity in chiral systems.