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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Two bridge-particle-mediated RET between chiral molecules.

A Salam1

  • 1Department of Chemistry, Wake Forest University, Winston-Salem, North Carolina 27109-7486, USA.

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Resonance energy transfer between chiral molecules is explained by molecular quantum electrodynamics. This study reveals how bridging particles and virtual photons facilitate energy transfer, with rates depending on molecular properties and geometry.

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Area of Science:

  • Quantum Electrodynamics
  • Molecular Physics
  • Spectroscopy

Background:

  • Resonance energy transfer (RET) is crucial for understanding energy migration in molecular systems.
  • Chiral molecules exhibit unique optical properties influencing energy transfer mechanisms.
  • Mediated transfer, involving bridging particles, adds complexity to RET dynamics.

Purpose of the Study:

  • To theoretically investigate resonance energy transfer between chiral molecules mediated by bridging particles.
  • To elucidate the role of virtual photons and multipole couplings in chiral RET.
  • To analyze the influence of molecular geometry and properties on energy transfer rates.

Main Methods:

  • Application of molecular quantum electrodynamics (QED) theory.
  • Utilizing fourth-order diagrammatic perturbation theory to calculate probability amplitudes.
  • Employing electric dipole, quadrupole, and magnetic dipole couplings.
  • Analysis of Fermi's golden rule rate contributions for various multipole moments.

Main Results:

  • A theoretical framework was established for bridge-mediated RET between chiral molecules.
  • Transfer rates are dependent on the specific multipole moments of the donor, acceptor, and mediators.
  • Mixed electric dipole-quadrupole contributions vanish in fluid phases for chiral systems.
  • Maximum transfer rates are observed for collinear geometries.
  • A multi-level mediator model is essential for accurate energy migration prediction.

Conclusions:

  • Molecular QED provides a robust framework for understanding complex RET phenomena.
  • The study offers insights into radiationless and radiative transfer mechanisms in chiral systems.
  • Findings are crucial for designing molecular systems with controlled energy transfer properties.