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When Dihedral Angles Mask Denticity in Molecular Conductance.

Kevin Batzinger1, Dylan Dyer2, M D Hashan C Peiris3

  • 1Department of Physics, Applied Physics, and Astronomy, Binghamton University-SUNY, Binghamton, NY, 13902, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|November 28, 2025
PubMed
Summary

Higher molecule-electrode coordination (denticity) does not guarantee higher single-molecule junction conductance. Dihedral angles, not denticity, significantly influence conductance, challenging assumptions in molecular electronics design.

Keywords:
break‐junction experimentdensity functional theorydihedral anglesmolecular electronicsmultidentate molecules

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Area of Science:

  • Molecular Electronics
  • Quantum Transport
  • Surface Science

Background:

  • Stronger molecule-electrode coupling is generally linked to higher conductance in single-molecule junctions.
  • It is widely assumed that increased molecular coordination (denticity) enhances junction conductance.

Purpose of the Study:

  • To investigate the relationship between denticity and conductance in single-molecule junctions.
  • To determine if higher denticity inherently leads to higher conductance.
  • To explore the influence of other factors, such as dihedral angles, on conductance.

Main Methods:

  • Utilized density functional theory (DFT) and the nonequilibrium Green's function (NEGF) technique for theoretical simulations.
  • Employed mechanically controlled break-junction (MCBJ) experiments for empirical validation.
  • Studied a single N-heterohexacene molecule with tetradentate ethyl sulfide anchors to vary effective denticity within one construct.

Main Results:

  • Contrary to expectations, increasing denticity did not result in higher conductance.
  • A strong correlation was observed between conductance and the dihedral angle between the electrode and the molecular core.
  • Simulated and experimental results showed that dihedral angles have a greater impact on conductance than denticity alone.
  • Different denticities merged into a single conductance feature, making them indistinguishable by conductance.

Conclusions:

  • Denticity alone is insufficient for designing highly conductive molecular junctions.
  • The influence of dihedral angles on conductance can dominate over denticity effects.
  • Assumptions linking specific conductance features to denticity require careful re-evaluation.
  • Molecular design should consider the interplay between dihedral angles and denticity for optimizing conductance.