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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Saddle-Shaped Heterometallic 3d-4f Cluster: Structure and Magnetocaloric Effect.

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A novel gadolinium-cobalt cluster exhibits a unique saddle shape and a central cavity. This heterometallic complex shows promise for magnetic cooling applications due to its significant magnetic entropy change.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetochemistry

Background:

  • Heterometallic 3d-4f cluster complexes are of significant interest.
  • These complexes offer unique structural aesthetics, properties, and applications.

Purpose of the Study:

  • To synthesize and characterize a novel heterometallic gadolinium-cobalt cluster.
  • To investigate its structural features and magnetic properties for potential applications.

Main Methods:

  • Co-hydrolysis of Gd³⁺ and Co²⁺ in the presence of iminodiacetate (IDA).
  • Crystallographic studies to determine the cluster's structure.
  • Magnetic measurements to assess magnetic entropy change.

Main Results:

  • A saddle-shaped cyclic cluster [Gd₆₈Co₆₀(OH)₁₁₆(CH₃COO)₈(IDA)₅₆(CO₃)₄(C₂O₄)₈(H₂O)₉₂Cl₁₆]Cl₄₈·10H₂O·60CH₃OH was synthesized.
  • The structure features a nanometer-sized central cavity.
  • A maximum magnetic entropy change of 38.58 J·K⁻¹·kg⁻¹ was achieved at 3.0 K and 7.0 T.

Conclusions:

  • The synthesized Gd-Co cluster possesses unique structural characteristics.
  • Its notable magnetic entropy change positions it as a promising candidate for magnetic cooling applications.