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Thioamide-Modified Pincer Extractant for Selective Pd(II) Recovery.

Manabu Yamada1, Yuri Matsuba2, Riko Matsuba3

  • 1Department of Materials Science, Graduate School of Engineering Science, Akita University, 1-1 Tegatagakuen-Machi, Akita 010-8502, Japan.

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|January 7, 2026
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This summary is machine-generated.

A new thioamide-based pincer extractant efficiently recovers palladium(II) (Pd(II)) from complex mixtures. This novel ligand shows promise for recycling precious metals from spent catalysts and electronic waste.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Solvent extraction is crucial for recovering palladium(II) (Pd(II)) from secondary resources.
  • Conventional extractants often lack efficiency and selectivity for Pd(II).

Purpose of the Study:

  • Synthesize and evaluate a novel pincer extractant for enhanced Pd(II) recovery.
  • Investigate the coordination behavior and extraction mechanism of the new ligand.

Main Methods:

  • Synthesis of a novel pincer extractant with thioamide moieties.
  • Pd(II) extraction experiments varying shaking time and HCl concentration.
  • Characterization using 1H NMR, FT-IR, SCXRD, and XAS.

Main Results:

  • The extractant demonstrated effective Pd(II) recovery from simulated and real-world solutions (spent automotive catalyst leach liquor).
  • Distinct coordination behaviors were observed in solution (bidentate) versus crystalline state (tridentate pincer).
  • Optimal conditions for extraction and stripping were identified.

Conclusions:

  • The synthesized pincer extractant offers high efficiency and selectivity for Pd(II) recovery.
  • Understanding the coordination modes is key for designing advanced extractants.
  • This work supports the development of sustainable methods for precious metal recycling and catalyst design.