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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Donor-acceptor molecules are crucial for organic electronics.
  • Understanding molecular aggregation is key to controlling material properties.
  • The aggregation behavior of p-DTS(FBTTh2)2 (T1) and p-SIDT(FBTTh2)2 (H1) differs significantly.

Purpose of the Study:

  • To investigate and explain the differing aggregation behaviors of T1 and H1 in MTHF solutions.
  • To elucidate the molecular factors governing aggregation in these donor-acceptor systems.

Main Methods:

  • Optical spectroscopy was used to observe aggregation in solution and thin films.
  • Free energy molecular dynamics (MD) simulations were performed.
  • Force fields were derived from quantum-mechanical density functional theory calculations.

Main Results:

  • T1 aggregates in MTHF solution, while H1 does not.
  • MD simulations accurately reproduced the experimental observations.
  • Molecular symmetry, not side-chain length, was identified as the critical factor.
  • T1's symmetry allows for donor unit separation in aggregates; H1's symmetry does not.
  • H1 aggregation requires desolvation, leading to kinetic hindrance.

Conclusions:

  • Molecular symmetry is a primary determinant of aggregation behavior in these donor-acceptor molecules.
  • The differing aggregation tendencies of T1 and H1 are explained by steric constraints and solvation effects.
  • Computational methods provide accurate insights into molecular aggregation phenomena.