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Butterfly M2 IIIEr2 (MIII = Fe and Al) SMMs: Synthesis, Characterization, and Magnetic Properties.

Yan Peng1,2, Valeriu Mereacre1, Christopher E Anson1

  • 1Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 15, 76131 Karlsruhe, Germany.

ACS Omega
|August 29, 2019
PubMed
Summary

New iron and aluminum complexes containing erbium exhibit single-molecule magnet (SMM) behavior. The iron-containing SMM shows faster relaxation due to Fe-Fe and Fe-Er interactions, unlike the aluminum analog.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Single-molecule magnets (SMMs) are crucial for developing high-density data storage and quantum computing.
  • Erbium (ErIII) ions are known for their potential in SMM applications due to their large magnetic anisotropy.

Purpose of the Study:

  • To synthesize and characterize novel heterometallic complexes incorporating ErIII ions.
  • To investigate the magnetic properties, specifically SMM behavior, of the synthesized complexes.
  • To elucidate the influence of Fe-Fe and Fe-Er interactions on SMM performance.

Main Methods:

  • Synthesis of isostructural Fe2Er2 and Al2Er2 complexes using N-(2-pyridylmethyl)iminodiethanol (H2L, pmide), metal chlorides, and p-Me-PhCO2H.
  • Structural characterization revealing a planar butterfly motif with ErIII ions at the wingtip positions.
  • Magnetic measurements, including alternating current (ac) and direct current (dc) susceptibility studies, to assess SMM behavior.

Main Results:

  • Two isostructural complexes, [Fe2Er2(μ3-OH)2(pmide)2(p-Me-PhCO2)6]·2MeCN (1) and [Al2Er2(μ3-OH)2(pmide)2(p-Me-PhCO2)6]·2MeCN (2), were successfully synthesized.
  • Both complexes exhibit single-molecule magnet (SMM) behavior.
  • The Fe2Er2 complex demonstrates faster magnetic relaxation and a reduced energy barrier compared to the Al2Er2 complex, attributed to Fe-Fe and Fe-Er interactions.

Conclusions:

  • The synthesized Fe2Er2 and Al2Er2 complexes are isostructural and display SMM properties.
  • The presence of iron ions and their interactions significantly influence the magnetic relaxation dynamics and energy barrier of the SMM.
  • These findings contribute to the understanding of heterometallic SMMs and the design of materials with tailored magnetic properties.