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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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First magnets based on thiocyanato-bridges.

Maliheh Mousavi1, Virginie Béreau, Carine Duhayon

  • 1CNRS, LCC (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France.

Chemical Communications (Cambridge, England)
|September 6, 2012
PubMed
Summary

Two-dimensional molecule-based magnets were synthesized using cobalt(II) or nickel(II) and molybdenum(III) thiocyanate complexes. The cobalt-molybdenum compound exhibits magnetic ordering up to 39 K, while the nickel-molybdenum compound is non-magnetic.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Magnetism

Background:

  • Two-dimensional (2-D) molecule-based magnets are of interest for potential applications in molecular electronics and spintronics.
  • The design of such materials often involves bridging ligands to connect magnetic metal ions in extended networks.
  • Thiocyanate (NCS) ligands are versatile linkers in constructing molecule-based magnetic materials.

Purpose of the Study:

  • To synthesize and characterize novel 2-D molecule-based magnets with {3d-4d} transition metal ions.
  • To investigate the magnetic properties of these newly formed compounds, specifically focusing on magnetic ordering.
  • To understand the relationship between crystal structure and magnetic behavior in these systems.

Main Methods:

  • Reaction of [Mo(III)(NCS)(6)](3-) with Ni(II) or Co(II) complexes.
  • Crystallographic analysis to determine the structure of the resulting 2-D networks.
  • Magnetic susceptibility measurements to determine magnetic ordering temperatures (T(C)) and ground state properties.

Main Results:

  • Successful synthesis of 2-D NCS-bridged {3d-4d} molecule-based magnets.
  • The {Co(3)Mo(2)} compound exhibits ferromagnetic ordering with a Curie temperature (T(C)) of 39 K.
  • The {Ni(3)Mo(2)} compound displays a non-magnetic ground state due to exact compensation between individual sub-lattices.

Conclusions:

  • The study demonstrates the feasibility of creating 2-D molecule-based magnets using NCS bridging ligands.
  • The magnetic behavior is highly dependent on the choice of 3d transition metal ion (Co vs. Ni).
  • The findings provide insights into the structure-property relationships governing magnetic ordering in these materials.