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Correction: Dodecanuclear [NiII8Ln<sub>4</sub>] clusters and rings of corner-sharing {NiII2Ln<sub>2</sub>} cubanes (Ln = Dy, Gd, Y); magnetic and magnetothermal properties.

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A Ferromagnetically Coupled, Bell-Shaped [Ni4Gd5] Cage.

Foteini E Kakaroni1, Demetrios I Tzimopoulos2, Hector W L Fraser3

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New nickel-gadolinium and nickel-yttrium clusters exhibit ferromagnetic interactions and magnetic cooling properties. Complex 1 demonstrates significant temperature reduction via adiabatic demagnetization, highlighting its potential for low-temperature applications.

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Area of Science:

  • Coordination Chemistry
  • Magnetochemistry
  • Materials Science

Background:

  • Metal-organic frameworks and molecular clusters are of interest for their unique magnetic properties.
  • Designing polynuclear metal complexes with specific architectures is crucial for developing advanced magnetic materials.

Purpose of the Study:

  • To synthesize and characterize novel Ni-M (M = Gd, Y) heterometallic clusters.
  • To investigate the magnetic properties and low-temperature behavior of these complexes.

Main Methods:

  • Synthesis of Ni-M clusters using NiCl2·6H2O, a pyridine-amidoxime ligand, benzoic acid, and M(NO3)3·6H2O.
  • Structural characterization of the resulting complexes.
  • Magnetic susceptibility measurements (dc and ac) from 2-300 K.
  • Heat-capacity measurements for magnetic cooling evaluation.

Main Results:

  • Successful synthesis of two bell-shaped {Ni4M5} clusters, [Ni4Gd5(...)] (1) and [Ni4Y5(...)] (2).
  • Both complexes exhibit ferromagnetic intermolecular interactions.
  • Complex 1 shows adiabatic demagnetization cooling from 9.6 K to 2.3 K with a 7 T to 0 T field change.

Conclusions:

  • The synthesized Ni-M clusters possess unique magnetic characteristics.
  • Complex 1 demonstrates potential as a magnetic refrigerant for low-temperature applications.
  • The study contributes to the development of molecular magnetic materials with tunable properties.