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Predicting the switchable screw sense in fluorene-based polymers.

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Chirality switching in poly(9,9-dioctylfluoren-2,7-diyl) (PDOF) occurs on silica surfaces, not in vacuum. This transition, crucial for inducing chirality, is supported by experimental evidence and theoretical spectra.

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Computational Chemistry

Background:

  • Poly(9,9-dioctylfluoren-2,7-diyl) (PDOF) is a conjugated polymer with potential applications in organic electronics.
  • Understanding the factors that control PDOF's chirality is essential for its application in circularly polarized light-emitting devices.

Purpose of the Study:

  • To investigate the free-energy landscape of chirality switching in PDOF.
  • To determine the role of the substrate and chain assembly in inducing chirality in PDOF.

Main Methods:

  • Reconstruction of the chirality-switching free-energy landscape using molecular dynamics simulations.
  • Simulations conducted on amorphous silica surfaces and in vacuum for single and multiple PDOF chains.
  • Experimental validation using circularly polarized light (CPL) for chirality induction.
  • Theoretical calculation of electronic circular dichroism (ECD) spectra.

Main Results:

  • Chirality switching from achiral to chiral states was observed exclusively on amorphous silica surfaces, with an activation free energy of 35 kcal/mol.
  • Enantiomeric (homochiral) basins were detected on silica, indicating stable chiral conformations.
  • Experimental results confirmed effective chirality induction in PDOF films on quartz glass using CPL, but not in solutions or suspensions.
  • Theoretical ECD spectra for helical structures in enantiomeric basins matched experimental spectra.

Conclusions:

  • Interactions between PDOF and amorphous silica surfaces are critical for enabling chirality switching.
  • Chain assembly plays a significant role in the observed chirality induction.
  • The study provides a comprehensive understanding of PDOF's chirality-switching mechanism, relevant for developing chiral optoelectronic materials.