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Unveiling Intermolecular Frustrated Lewis Pairs in Single-Molecule Junctions.

Yalin Xing1, Haoran Sun2, Jiahong Hu1

  • 1School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.

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|October 28, 2025
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Summary
This summary is machine-generated.

Single-molecule junctions now detect frustrated Lewis pairs (FLPs) using conductance. This breakthrough enables studying weak interactions at the single-molecule level, advancing molecular electronics.

Keywords:
frustrated lewis pairsmolecular electronicsmolecular probesingle‐molecule junctions

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Area of Science:

  • Molecular Electronics and Supramolecular Chemistry
  • Single-Molecule Studies of Noncovalent Interactions

Background:

  • Intermolecular frustrated Lewis pairs (FLPs) are crucial in catalysis but difficult to study at the single-molecule level due to their transient nature.
  • Existing methods struggle to detect the ultralow interaction energies and transient dynamics of FLPs, hindering mechanistic understanding of weak orbital coupling.

Purpose of the Study:

  • To develop a method for detecting and characterizing frustrated Lewis pairs (FLPs) at the single-molecule scale.
  • To utilize single-molecule conductance as a sensitive probe for weak orbital perturbations and noncovalent interactions.

Main Methods:

  • Engineering a sterically hindered molecular probe (OPE-Py-M) capable of forming stable in situ FLP adducts.
  • Utilizing scanning tunneling microscopy break junction (STM-BJ) techniques to form and measure single-molecule electrical junctions.
  • Validating FLP formation through Nuclear Magnetic Resonance (NMR) spectroscopy and UV-Visible (UV-Vis) charge-transfer band analysis.

Main Results:

  • Stable frustrated Lewis pair (FLP) adducts were successfully formed within single-molecule junctions.
  • A quantifiable conductance attenuation (from 10-4.39 to 10-4.78 G0) was observed upon FLP formation, indicating electronic perturbation.
  • NMR upfield shifts and UV-Vis charge-transfer bands corroborated the formation and electronic changes associated with FLPs.

Conclusions:

  • Single-molecule conductance measurements provide an ultrasensitive platform for detecting orbital perturbations below hydrogen-bond energy thresholds.
  • This technique enables unprecedented investigation of noncovalent interactions, including FLPs, in molecular electronics.
  • The study opens new avenues for understanding and designing self-assembled molecular systems and catalytic processes.