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Related Concept Videos

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Updated: Jan 20, 2026

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Bis-NHC-Diarylethene Palladium Complexes: Dynamic Behavior and Self-Tuning Photoswitching.

Rustam B Shnigirev1,2, Iana I Surzhikova3, Anastasia A Danshina3,4

  • 1A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Street, Irkutsk, 664033, Russia.

Angewandte Chemie (International Ed. in English)
|January 19, 2026
PubMed
Summary

Researchers developed a novel palladium complex that changes its catalytic activity using light. This photoresponsive system offers precise control over chemical reactions, enabling adaptive catalysis with high efficiency.

Keywords:
DiaryletheneN‐heterocyclic carbenePalladium complexPhotorearrangementPhotoswitching

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Developing photoresponsive materials for precise control of chemical processes is crucial.
  • Transition-metal complexes offer unique properties but require robust photoresponsive designs.
  • Diarylethene-based systems are promising for photochromic applications.

Purpose of the Study:

  • To create a self-tuning photochromic system based on a diarylethene-derived bis-NHC-palladium complex.
  • To investigate the light-induced isomerization and its effect on catalytic activity.
  • To establish a link between photoisomerization and catalytic performance for adaptive catalysis.

Main Methods:

  • Synthesis and characterization of a diarylethene-derived bis-NHC-palladium complex.
  • Photochemical studies including photocyclization and trans/cis isomerization.
  • Crystallographic analysis of different isomers.
  • Spectroscopic and computational investigations of electronic transitions.
  • Evaluation of catalytic activity in Suzuki-Miyaura coupling reactions.

Main Results:

  • The trans-anti complex undergoes efficient stepwise photocyclization and light-induced trans/cis isomerization.
  • The cis-anti isomer is thermodynamically more stable and exhibits enhanced photochromic performance with multistate switching.
  • A dynamic equilibrium exists among several photoactive palladium species.
  • Catalytic activity in Suzuki-Miyaura coupling is reversibly switched by light; photocyclized forms show negligible activity, while open forms are highly efficient.
  • Complex geometry controls the balance between nanoparticle-mediated and homogeneous reactivity.

Conclusions:

  • A novel self-tuning photochromic palladium complex with reversible multistate switching has been developed.
  • Light can precisely control the catalytic activity of the palladium complex, linking photoisomerization to catalytic performance.
  • This system provides a new strategy for adaptive catalysis by controlling reactivity through light-induced geometric changes.