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The ferromagnetic [Ln2Co6] heterometallic complexes.

Xiao-Qing Zhao1, Jin Wang2, Dong-Xu Bao2

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Dalton Transactions (Cambridge, England : 2003)
|January 28, 2017
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New 3d-4f heterometallic complexes containing lanthanide and cobalt ions were synthesized. These magnetic materials exhibit ferromagnetic coupling and slow relaxation of magnetization, indicating potential for advanced magnetic applications.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Heterometallic complexes incorporating 3d and 4f metal ions are of significant interest for their unique magnetic properties.
  • Lanthanide-cobalt clusters offer tunable electronic structures and magnetic behaviors.

Purpose of the Study:

  • To synthesize and characterize novel 3d-4f heterometallic complexes.
  • To investigate the structural and magnetic properties of these complexes, focusing on lanthanide-cobalt interactions.

Main Methods:

  • Synthesis of four heterometallic complexes using 6-chloro-2-pyridinol and pivalic acid ligands.
  • Single-crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility measurements to probe magnetic interactions.

Main Results:

  • Four complexes with the formula {[Ln2Co6(OH)4(L1)6(L2)8(CH3CN)2]·nCH2Cl2} were successfully synthesized (Ln = Dy, Ho, Gd, Y).
  • Structural analysis revealed a [Ln2Co6] core with a unique edge-sharing double-trigonal-bipyramid configuration.
  • Magnetic studies indicated ferromagnetic coupling in Dy-Co and Ho-Co complexes, with Dy-Co complex showing slow relaxation of magnetization.

Conclusions:

  • The synthesized heterometallic complexes possess intriguing structural and magnetic properties.
  • The observed ferromagnetic coupling and slow magnetic relaxation in specific complexes highlight their potential for developing single-molecule magnets or other magnetic materials.