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Manipulating On/Off Single-Molecule Magnet Behavior in a Dy(III)-Based Photochromic Complex.

Yu-Juan Ma1, Ji-Xiang Hu1, Song-De Han1

  • 1College of Chemistry and Chemical Engineering , Qingdao University , Shandong 266071 , P. R. China.

Journal of the American Chemical Society
|January 21, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed new lanthanide-based chain complexes exhibiting reversible room temperature photochromism and photomagnetism. These materials demonstrate switchable single-molecule magnet behavior triggered by light, paving the way for optical switches and magnetic memories.

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Area of Science:

  • Materials Science
  • Magnetism
  • Photochemistry

Background:

  • Developing materials with switchable magnetic properties at room temperature (RT) is crucial for advanced technologies like optical switches and magnetic memories.
  • Exploiting photochromism and photomagnetism to achieve single-molecule magnet (SMM) behavior remains a significant challenge in materials science.

Purpose of the Study:

  • To synthesize and characterize novel lanthanide-based chain complexes capable of exhibiting photochromic and photomagnetic properties at RT.
  • To investigate the mechanism of light-induced SMM behavior in these materials and explore their potential applications.

Main Methods:

  • Solvothermal synthesis of lanthanide (Dy, Gd, Y) chain complexes with hydroxyethylidene diphosphonate (HEDP) and 2,4,6-tri(4-pyridyl)-1,3,5-triazine (TPT).
  • UV light irradiation experiments to induce photochromic and photomagnetic effects.
  • Magnetic property measurements to assess SMM behavior and magnetic relaxation dynamics.

Main Results:

  • The synthesized complexes (QDU-1) displayed reversible photochromic and photomagnetic behaviors at RT upon UV irradiation.
  • A photoinduced electron transfer (PET) mechanism involving photogenerated radicals was identified as the cause of these phenomena.
  • The Dy(III) congener exhibited strong ferromagnetic coupling and slow magnetic relaxation without applied dc fields, demonstrating SMM behavior after RT illumination.
  • This study reports the first observation of reversible RT photochromism and photomagnetism in lanthanide-based materials.

Conclusions:

  • The developed lanthanide complexes offer a novel platform for light-controlled magnetic properties.
  • The observed radical-actuated on/off SMM behavior provides a new strategy for designing light-induced SMMs for potential use in optical switches and magnetic memory devices.