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Quantum interference in electron transport arises from through-space and through-bond interactions. Destructive σ interference in ethylenediamine conformers is influenced by dihedral angles and their impact on these interactions.

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Area of Science:

  • Quantum chemistry
  • Molecular electronics
  • Condensed matter physics

Background:

  • Orbital interactions are classified as through-space (TS) and through-bond (TB).
  • Understanding these interactions is crucial for molecular properties and electron transport.
  • Quantum interference, specifically σ interference, is a key phenomenon in σ systems.

Purpose of the Study:

  • To elucidate the origin of σ interference in electron transport.
  • To investigate the roles of TS and TB interactions in σ interference.
  • To analyze the influence of molecular conformation on σ interference.

Main Methods:

  • Electron transport calculations using density functional theory and nonequilibrium Green's function methods.
  • Fragment molecular orbital (FMO) analysis to study TS and TB interactions.
  • Chemical graph theory analysis (ladder C model) to explore topological origins.

Main Results:

  • Destructive σ interference was confirmed in the syn and gauche conformers of ethylenediamine.
  • TB interactions dictate frontier orbital distribution and energy alignment.
  • Changes in TS interactions, driven by dihedral angles, modulate the energy gap and enable σ interference in specific conformers.

Conclusions:

  • σ interference arises from the interplay between TS and TB interactions.
  • Vicinal interactions, sensitive to dihedral angles, critically determine the occurrence of σ interference.
  • These findings provide insights for designing molecular systems leveraging σ interference.