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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Learning how planarization can affect dichroic patterns in polyfluorenes.

Adriana Pietropaolo1, Tamaki Nakano2

  • 1Dipartimento di Scienze della Salute, Università di Catanzaro, Catanzaro, Italy.

Chirality
|March 12, 2020
PubMed
Summary

The study predicts polyfluorene

Keywords:
chiral polymerschiral switchcircular dichroism spectramolecular dynamicspolymer simulations

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Area of Science:

  • Polymer Science
  • Spectroscopy
  • Computational Chemistry

Background:

  • Polyfluorenes are conjugated polymers with optoelectronic applications.
  • Understanding their conformational dynamics is crucial for material properties.

Purpose of the Study:

  • To predict the circular dichroism (CD) spectra of polyfluorene.
  • To investigate the influence of thermal vibrations and conformation on CD spectra.

Main Methods:

  • Computational prediction of circular dichroism spectra.
  • Simulations of polyfluorene single chains in p-twisted helix and planarized conformations.
  • Inclusion of thermal vibrations at 300 K.

Main Results:

  • Planarized polyfluorene sections exhibit a red-shifted positive dichroic band (446-456 nm) under thermal vibrations.
  • Excitation energy (S1 ← S0) decreases with planarization (3.29 eV to 2.71 eV).
  • Thermal vibrations and rotations alter CD spectra, with bent conformers inducing a positive band near 450 nm.

Conclusions:

  • Conformational changes and thermal effects significantly impact polyfluorene's CD spectra.
  • Chirality is preserved in planarized sections under thermal stress.
  • Predictive modeling aids in understanding structure-property relationships in polyfluorenes.