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Electrochromic poly(acetylene)s with switchable visible/near-IR absorption characteristics.

Anja C Pauly1, C Daniel Varnado2, Christopher W Bielawski2,3

  • 1Institute of Technical and Macromolecular Chemistry, University Hamburg, Bundesstraße 45, 20146, Hamburg, Germany.

Macromolecular Rapid Communications
|September 3, 2013
PubMed
Summary

This study introduces a novel ferrocene-containing polymer with switchable visible and near-IR absorption. Its optical properties can be reversibly tuned through oxidation and reduction, enabling new material applications.

Keywords:
conjugated polymerselectrochromismferrocenefunctionalization of polymers

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Ferrocene-containing polymers offer unique redox and optical properties.
  • Developing materials with tunable absorption is crucial for advanced applications.
  • Postpolymerization modification allows for precise functionalization of polymer backbones.

Purpose of the Study:

  • To synthesize a novel poly(acetylene) derivative incorporating ferrocene.
  • To investigate the switchable optical absorption properties of the ferrocene-containing polymer.
  • To demonstrate reversible control over visible and near-IR absorption spectra.

Main Methods:

  • Postpolymerization amidation using aminoferrocene and a polymer precursor with pentafluorophenyl ester groups.
  • Spectroscopic analysis (UV-Vis-NIR) of the neutral and oxidized polymer states.
  • Redox cycling using silver tetrafluoroborate and decamethylferrocene to induce and reverse spectral changes.

Main Results:

  • Successful incorporation of ferrocene into the poly(acetylene) backbone.
  • The neutral polymer exhibits strong absorbance at 553 nm.
  • Oxidation shifts the absorption maximum to ≈ 1215 nm (near-IR).
  • Reduction with decamethylferrocene restores the original visible absorption profile.

Conclusions:

  • The synthesized ferrocene-containing polymer displays switchable visible/near-IR absorption.
  • This switchability is achieved through reversible redox reactions of the ferrocene units.
  • The material holds potential for applications requiring tunable optical properties.