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Mechanical Manipulation of Quantum Interference in Single-Molecule Junctions.

Amit Sil1, Munirah Alsaqer2, Chiara E Spano1,3

  • 1Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK.

Small (Weinheim an Der Bergstrasse, Germany)
|January 15, 2024
PubMed
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This study introduces novel molecular wires with 1,1'-dinaphthyl units that act as highly sensitive mechanical switches. Mechanical force triggers conformational changes, altering conductance and enabling new possibilities in molecular electronics.

Area of Science:

  • Molecular electronics
  • Nanoelectromechanical systems
  • Quantum mechanical phenomena

Background:

  • Mechanosensitive molecular junctions are crucial for nanoelectromechanical systems.
  • Existing methods using molecule-electrode interface reconfiguration have limitations in reproducibility.
  • Conformational flexibility in molecular wires offers an alternative approach to mechanosensitivity.

Purpose of the Study:

  • To investigate the mechanosensitive properties of molecular wires featuring the 1,1"-dinaphthyl moiety.
  • To demonstrate the potential of these molecular wires as sensitive mechanical switches.
  • To elucidate the underlying mechanisms of mechanosensitivity in these systems.

Main Methods:

  • Assembly of single-molecule junctions using 1,1"-dinaphthyl-containing molecular wires.
Keywords:
11’‐dinaphthylmechanical switchmechanoresistivitymolecular electronics

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  • Mechanical manipulation to induce conformational transitions (transoid to cisoid).
  • Electrical transport measurements and theoretical modeling (charge reconfiguration, quantum interference).

    • Main Results:

    • The 1,1"-dinaphthyl molecular wires exhibit distinct transport properties in their transoid and cisoid conformers.
    • Mechanical triggering of the transoid to cisoid transition results in a highly sensitive mechanical switch.
    • A high switching ratio exceeding 10^2 was achieved.
    • Theoretical modeling confirmed that charge reconfiguration and quantum interference modulation drive the observed electromechanical behavior.

    Conclusions:

    • The 1,1"-dinaphthyl moiety provides a novel chemical structure for developing molecular switches with outstanding electromechanical properties.
    • Conformational flexibility and its impact on charge delocalization are key to designing sensitive single-molecule devices.
    • This work expands the experimental capabilities in molecular electronics with a new class of mechanosensitive materials.