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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.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Crystal Field Theory
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Isomerism in Complexes
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Electronic vs. structural ordering in a manganese(III) spin crossover complex.

Anthony J Fitzpatrick1, Elzbieta Trzop, Eliza Trzop2

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Chemical Communications (Cambridge, England)
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Summary
This summary is machine-generated.

Spin transitions in a manganese(III) complex reveal three distinct structural phases. An aperiodic low-temperature phase arises from anion ordering, impacting the material's properties.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Solid-State Physics

Background:

  • Spin transition phenomena are crucial for developing advanced functional materials.
  • Manganese(III) complexes are known to exhibit diverse magnetic behaviors.

Purpose of the Study:

  • To investigate the spin transition and structural phases of a novel Mn(III) complex.
  • To understand the relationship between spin state, structure, and anion ordering.

Main Methods:

  • Single-crystal X-ray diffraction to determine structural phases.
  • Magnetic susceptibility measurements to probe spin states (S=2 and S=1).
  • Analysis of anion ordering to explain observed aperiodicity.

Main Results:

  • Observation of three distinct structural phases: high-temperature (S=2), intermediate (S=1/S=2 ordered), and low-temperature (S=1).
  • Identification of an aperiodic low-temperature phase.
  • Correlation of aperiodicity with long-range ordering of the NTf2(-) anions.

Conclusions:

  • The Mn(III) complex exhibits a symmetry-breaking spin transition with complex structural evolution.
  • Anion ordering plays a critical role in stabilizing the aperiodic low-temperature phase.
  • This study provides insights into designing materials with tunable magnetic properties through anion control.