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Quantum interference (QI) effects modulate molecular charge transport. This study evaluates QI rules for anthracene and fluorene derivatives, finding cross-conjugated systems have lower conductance, but meta-connections enhance transmission.

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Area of Science:

  • Molecular electronics
  • Quantum interference phenomena
  • Charge transport in organic molecules

Background:

  • Quantum interference (QI) effects are crucial for controlling charge transport in single molecules.
  • Existing transmission selection rules for QI effects often fail for complex conjugated systems.
  • Anthracene and fluorene derivatives present challenges for qualitative QI rule prediction due to diverse structural features.

Purpose of the Study:

  • To evaluate the performance of different transmission rules for predicting QI effects in anthracene and fluorene derivatives.
  • To investigate the influence of conjugation type (linear, broken, cross), heteroatoms, and ring structures on molecular conductance.
  • To compare electron transport properties of various polycyclic compounds under identical computational conditions.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to determine electronic structures.
  • The nonequilibrium Green function (NEGF) method was used to compute electron transport properties.
  • Local transmission plots were analyzed to understand charge transport pathways.

Main Results:

  • Cross-conjugated systems exhibit significantly reduced conductance compared to linear-conjugated systems.
  • Meta-connected junctions show enhanced charge transmission despite reduced overall conductance in cross-conjugated systems.
  • Aromatic cores generally display higher zero-bias conductance than previously reported, challenging the negative aromaticity-conductance relationship.

Conclusions:

  • The study validates the impact of conjugation type and electrode connectivity on molecular conductance, aligning with experimental findings.
  • The findings highlight the limitations of current QI selection rules for complex molecular architectures.
  • This work provides a more nuanced understanding of structure-conductance relationships in molecular systems.