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Dinuclear Dysprosium Compounds: The Importance of Rigid Bridges.

Rouven F Pfleger1, Matteo Briganti2, Niels Bonde3

  • 1Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Kaiserstr. 12, 76131, Karlsruhe, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 7, 2024
PubMed
Summary

We synthesized two dinuclear dysprosium (Dy3+) complexes with peroxide or fluoride bridges, revealing how bridges tune magnetic coupling and relaxation dynamics. These findings impact the design of single-molecule magnets (SMMs).

Keywords:
AxialityDysprosiumMagnetic RelaxationMagnetismSMM

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetism

Background:

  • Single-molecule magnets (SMMs) are crucial for future data storage and quantum computing.
  • Controlling magnetic properties of lanthanide complexes is key to developing efficient SMMs.
  • Dinuclear lanthanide complexes offer tunable magnetic interactions through bridging ligands.

Purpose of the Study:

  • To synthesize and characterize isostructural dinuclear dysprosium (Dy3+) complexes bridged by peroxide (O22-) or fluoride (F-).
  • To investigate the influence of different bridging ligands on magnetic coupling and relaxation dynamics.
  • To compare the magnetic behavior of the dinuclear complexes with a previously reported monomeric building block.

Main Methods:

  • Synthesis of dinuclear Dy3+ complexes.
  • Structural characterization using X-ray crystallography.
  • Magnetic property measurements, including magnetic susceptibility and relaxation dynamics studies.

Main Results:

  • Two isostructural dinuclear Dy3+ complexes were successfully synthesized, differing in their bridging ligands (peroxide vs. fluoride).
  • The bridging ligand significantly affects the Dy-Dy distance and the nature of magnetic coupling (antiferromagnetic for peroxide, ferromagnetic for fluoride).
  • Relaxation dynamics were found to be very fast for the bis-fluoride system, while the peroxide bridged system showed similar Raman relaxation parameters to the monomer.

Conclusions:

  • The choice of bridging ligand is critical in tuning the magnetic interactions and relaxation properties of dinuclear dysprosium complexes.
  • The presence of a second dysprosium ion plays a significant role in either enhancing or diminishing single-molecule magnet properties.
  • These findings provide valuable insights for the rational design of novel single-molecule magnets with tailored magnetic behaviors.