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Area of Science:

  • Molecular electronics
  • Single-molecule charge transport
  • Environmental effects on molecular properties

Background:

  • Solvent polarity influences molecular electronic properties and charge transport.
  • Dimethylaminobenzonitrile (DMABM) exhibits unique solvent-dependent electronic behavior, including dual fluorescence.

Purpose of the Study:

  • Investigate the effect of solvent polarity on charge transport through single DMABN molecules.
  • Elucidate the mechanism behind the observed changes in conductance in different solvents.

Main Methods:

  • Scanning tunneling microscopy break junction (STM-BJ) technique to measure single-molecule conductance.
  • Ab initio molecular dynamics (AIMD) simulations with density functional theory (DFT) to model molecular behavior.
  • Non-equilibrium Green's function with DFT (NEGF-DFT) to calculate conductance.

Main Results:

  • Conductance increased by an order of magnitude in polar solvents compared to nonpolar solvents.
  • A second, distinct conductance value was observed in polar solvents.
  • AIMD simulations supported the hypothesis of twisted DMABN stabilization in polar solvents.
  • NEGF-DFT calculations revealed significant changes in frontier orbitals and transmission function at twisted configurations.

Conclusions:

  • Solvent polarity plays a crucial role in modulating charge transport through DMABN molecules.
  • The observed dual conductance is attributed to the stabilization of twisted DMABN conformations in polar solvents.
  • This study provides a molecular-level understanding of solvent effects in single-molecule junctions.