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Robust High-Refractive-Index Polymer Films Enabled by a Bismuth-Dithiocarbamate Structure.

Tomoaki Tanaka1, Atsushi Ohtaka1, Osamu Shimomura1

  • 1Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku, Osaka, 535-8585, Japan.

ACS Macro Letters
|April 24, 2026
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This summary is machine-generated.

Researchers developed stable, high-refractive-index polymers using bismuth-sulfur bonds. These bismuth-containing polymers offer excellent material stability and optical properties for advanced applications like near-infrared optics.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Optics

Background:

  • High-refractive-index polymers are crucial for optical devices.
  • Achieving high refractive index, stability, and processability simultaneously is challenging, especially with heavy elements.

Purpose of the Study:

  • To develop a novel molecular design strategy for high-refractive-index polymers.
  • To synthesize and characterize a bismuth-containing polymer with enhanced optical and material properties.

Main Methods:

  • Molecular design based on bismuth-sulfur (Bi-S) bonding.
  • Synthesis of a radical-polymerizable bismuth-dithiocarbamate monomer.
  • Bulk polymerization to form a self-supporting polymer film.

Main Results:

  • A bismuth-containing polymer film with a high refractive index (n_D = 1.75) was successfully synthesized.
  • The polymer exhibited excellent thermal, photochemical, organic solvent, and water stability.
  • The material is suitable for wavelength-selective optical applications, including near-infrared optics.

Conclusions:

  • The study introduces a new molecular design for high-refractive-index polymers utilizing Bi-S bonds.
  • This work provides valuable guidelines for creating stable, high-performance optical materials.
  • This is the first evaluation of refractive-index properties in polymers containing Bi-S bonds.