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Light-responsive three-dimensional microstructures composed of azobenzene-based palladium complexes.

Mina Han1, Tomohiro Hirade, Yumi Okui

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Photoisomerizable palladium complexes form light-responsive microstructures. Solvent choice dictates 2D or 3D crystalline morphology, with UV light triggering disassembly in polar solvents by breaking weak π-stacking interactions.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Azobenzene-based metal complexes offer tunable photoresponsive properties.
  • Crystalline architectures can be assembled from molecular components.
  • Solvent engineering is crucial for controlling self-assembly and material properties.

Purpose of the Study:

  • To investigate the light-induced assembly and disassembly of azobenzene-palladium complexes.
  • To explore the influence of solvent polarity on crystalline morphology and stability.
  • To understand the mechanisms of UV-triggered structural transformations.

Main Methods:

  • Synthesis of azobenzene-based palladium complexes.
  • Solvent-controlled crystallization to form 2D and 3D architectures.
  • UV irradiation studies in various solvent mixtures (e.g., THF-H2O, acetone-H2O, DMF-H2O).
  • Morphological analysis using microscopy and characterization of dissociation products.

Main Results:

  • Achieved transformation from 2D parallelogram sheets to 3D cuboid/rhombus structures by altering solvents (THF to acetone/DMF).
  • Controlled structure size (nanometers to micrometers) via complex concentration.
  • Observed UV-induced disassembly of 3D structures in polar DMF-H2O, including ligand dissociation.
  • Noted UV-induced disassembly in acetone-H2O without ligand dissociation, suggesting solvent-dependent mechanisms.

Conclusions:

  • UV light triggers disassembly of azobenzene-palladium complex architectures in polar solvents.
  • Solvent polarity influences the extent of disassembly, potentially via π-stacking disruption and metal-solvent coordination.
  • Photoisomerization of azobenzene moieties plays a key role in light-responsive structural changes.