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Researchers developed a chiral helical polymer using copper-salen units. This new material shows significantly enhanced circular dichroism, offering a platform for advanced chiral and spin-dependent functional materials.

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Area of Science:

  • Coordination Polymer Chemistry
  • Chiral Materials Science
  • Supramolecular Chemistry

Background:

  • Chiral materials with strong chiroptical properties are crucial for advanced applications.
  • Developing novel helical polymers with amplified asymmetry remains a synthetic challenge.

Purpose of the Study:

  • To synthesize and characterize a novel Cu-salen helical complex ladder polymer (HLP-Cu).
  • To investigate the chiroptical properties of HLP-Cu and compare them to related analogues.
  • To elucidate the factors contributing to the amplified asymmetry in the helical polymer.

Main Methods:

  • Covalent synthesis of Cu-salen units into a helical complex ladder polymer (HLP-Cu).
  • Circular dichroism (CD) spectroscopy to measure chiroptical properties.
  • Titration experiments to study asymmetry amplification.
  • Time-dependent density functional theory (TD-DFT) calculations.

Main Results:

  • HLP-Cu exhibits significantly enhanced circular dichroism (up to 5-fold stronger) compared to planar analogues and monomers.
  • A maximum dissymmetry factor of 7.4 × 10⁻³ was achieved for HLP-Cu.
  • Cooperative amplification of asymmetry was observed, attributed to extended conjugation and helical geometry.
  • TD-DFT calculations supported the hypothesis, showing increased rotational strength with conjugation length and helical order.

Conclusions:

  • The synthesized HLP-Cu represents a new polymer platform for chiral materials.
  • Extended conjugation and helical structure are key to amplifying chiroptical properties.
  • This work opens avenues for designing functional chiral materials with tunable chiroptical and spin-dependent characteristics.