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Quantum Interference Enhanced Chemical Responsivity in Single-Molecule Dithienoborepin Junctions.

Masoud Baghernejad1,2,3, Colin Van Dyck4, Justin Bergfield5

  • 1Transport at Nanoscale Interface Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 19, 2019
PubMed
Summary

Researchers harnessed quantum interference in dithienoborepin (DTB) molecular junctions to create a single-molecule sensor. This sensor detects fluoride ions, showing significant conductance changes based on boron atom position and quantum effects.

Keywords:
break-junction techniquefluoride ionsquantum interferencescanning tunneling microscopysingle-molecule charge transport

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Area of Science:

  • Molecular electronics
  • Single-molecule sensing
  • Quantum interference phenomena

Background:

  • Chemical control over charge transport in molecular junctions is crucial for nanoscale sensing.
  • Quantum interference effects offer a pathway to enhance chemical control in molecular systems.

Purpose of the Study:

  • To investigate the use of quantum interference in dithienoborepin (DTB) molecular junctions for fluoride ion sensing.
  • To optimize the response of single-molecule DTB junctions to specific fluoride ion coordination.

Main Methods:

  • Measurement of single-molecule conductance using scanning tunneling microscopy break-junction (STM-BJ) technique.
  • Exposure of DTB molecular junctions to fluoride ions in solution.
  • Quantum chemical characterization to understand charge transport mechanisms.

Main Results:

  • Significant changes in single-molecule conductance were observed upon fluoride ion capture.
  • The magnitude of conductance change depended on the boron atom's position within the DTB isomer.
  • High switching ratios (up to four orders of magnitude) were achieved, indicating effective sensing.
  • Quantum chemical analysis confirmed that boron-fluoride coordination induces quantum interference via a cross-conjugated path.

Conclusions:

  • Boron-fluoride coordination in DTB molecular junctions can effectively modulate charge transport through quantum interference.
  • This work demonstrates a novel single-molecule sensor with high sensitivity and selectivity for fluoride ions.
  • The findings highlight the potential of exploiting quantum interference for advanced molecular sensing applications.