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Electron Push-Pull Effects on Intramolecular Charge Transfer in Perylene-Based Donor-Acceptor Compounds.

Mina Ahn1, Min-Ji Kim1, Dae Won Cho2

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|December 9, 2020
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Researchers synthesized novel perylene-based donor-acceptor compounds to study intramolecular charge transfer (ICT). They found that substituent effects and subunit combinations significantly influence photophysical properties, with some compounds exhibiting both ICT and reverse ICT (rICT).

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Area of Science:

  • Organic Chemistry
  • Photophysics
  • Materials Science

Background:

  • Donor-acceptor (D-A) molecules are crucial for optoelectronic applications.
  • Perylene derivatives offer tunable electronic and optical properties.
  • Understanding intramolecular charge transfer (ICT) is key to designing new functional materials.

Purpose of the Study:

  • To synthesize and characterize a series of asymmetric D-A perylene-based compounds (Peri-DPA(R)).
  • To investigate the influence of electron-donating and electron-withdrawing substituents on ICT properties.
  • To compare the photophysical and electrochemical behavior of D-A and D-A-D systems.

Main Methods:

  • Synthesis of five Peri-DPA(R) derivatives with varying para-substituents (R = CN, F, H, Me, OMe).
  • Steady-state spectroscopy (UV-Vis absorption and emission) to study ICT trends.
  • Femtosecond transient absorption (fs-TA) spectroscopy to probe excited-state dynamics.
  • Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) calculations.

Main Results:

  • A clear trend in ICT was observed, correlating with the electronic nature of the substituents (from electron-withdrawing to electron-donating).
  • Comparative studies revealed that both substituent effects and subunit combinations impact photophysical and electrochemical properties.
  • fs-TA spectroscopy confirmed ICT and reverse ICT (rICT) in CN-substituted compounds, indicating a mixed transition.
  • DFT/TD-DFT calculations supported the experimental findings of ICT and rICT.

Conclusions:

  • The synthesized Peri-DPA(R) compounds exhibit tunable ICT properties based on substituent effects.
  • The D-A-D architecture offers further modulation of photophysical behavior compared to D-A systems.
  • The observed rICT in specific compounds highlights the complex excited-state dynamics and potential for novel applications.