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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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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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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Two 3D Mn-based coordination polymers: synthesis, structure and magnetocaloric effect.

Ning-Fang Li1, Ye-Min Han1, Jia-Nian Li1

  • 1College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University Nanjing 211816 P. R. China yanxu@njtech.edu.cn.

RSC Advances
|May 6, 2022
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Summary
This summary is machine-generated.

Two novel manganese coordination polymers were synthesized, showing potential for antiferromagnetic interactions. These materials exhibit significant magnetocaloric effects, offering promising applications in cooling technologies.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Magnetism

Background:

  • Coordination polymers offer tunable magnetic properties.
  • Manganese-based materials are explored for magnetocaloric applications.

Purpose of the Study:

  • Synthesize novel 3D manganese coordination polymers.
  • Investigate their magnetic properties and magnetocaloric effect (MCE).

Main Methods:

  • Solvothermal synthesis of two manganese coordination polymers.
  • Magnetic susceptibility measurements.
  • Analysis of magnetocaloric effect (MCE) via -ΔSm values.

Main Results:

  • Successful synthesis of MnII6(CH3COO)2(HCOO)2(IN)8(C4H8O)2(H2O) and MnIII6MnII12(μ3-O)6(CH3COO)12(IN)18(H2O)7.5.
  • Evidence of potential antiferromagnetic interactions.
  • Achieved significant magnetocaloric effect values (-ΔSm: 26.27 and 37.69 J kg-1 K-1 at 7 T).

Conclusions:

  • The synthesized manganese coordination polymers exhibit promising magnetocaloric properties.
  • These materials represent a significant advancement in 3d-metal-based magnetic refrigerants.
  • Further research into these systems could lead to efficient MCE applications.