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Bidirectional Single-Molecule Photoconductors Based on ESIPT.

Jin Qiu1, Shuyu Jiang1, Yutian Zhang1

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.

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Researchers developed new single-molecule photoconductors using excited-state intramolecular proton transfer (ESIPT) and quantum interference (QI). These molecules show significant increases or decreases in conductance upon light exposure, paving the way for advanced molecular optoelectronics.

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Area of Science:

  • Molecular electronics
  • Optoelectronics
  • Photoconductivity

Background:

  • Single-molecule photoconductors are crucial for molecular optoelectronics.
  • Modulating bidirectional photoconductance at the single-molecule level remains a challenge.

Purpose of the Study:

  • To design high-performance single-molecule photoconductors with tunable photoconductance.
  • To explore the interplay of excited-state intramolecular proton transfer (ESIPT) and quantum interference (QI) effects.

Main Methods:

  • Utilized the scanning tunneling microscope break junction (STM-BJ) technique.
  • Investigated two structurally related 2-(2-hydroxyphenyl)pyridines (PPOH and PMOH).
  • Employed theoretical calculations to understand underlying mechanisms.

Main Results:

  • Achieved record-high photoconductance modulation in single-molecule junctions.
  • PPOH exhibited inverse photoconductance (∼120-fold decrease) upon 365 nm irradiation.
  • PMOH showed enhanced photoconductance (∼1.78-fold increase), demonstrating bidirectional control.
  • ESIPT and QI effects were identified as key drivers of observed photoconductance changes.

Conclusions:

  • A rational design strategy for single-molecule photoconductors based on ESIPT and QI was established.
  • The study bridges macroscopic photoconductor behavior with individual photoresponsive molecules.
  • Offers a new molecular design paradigm for ESIPT-driven QI effects in optoelectronics.