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Valence Bond Theory02:42

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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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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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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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CFT focuses on...
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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Analyzing Anisotropic Exchange in a Pentanuclear Os2 Ni3 Complex.

Andreas Heimermann1, Christoph van Wüllen1

  • 1Fachbereich Chemie and Forschungszentrum OPTIMAS Technische Universität, Kaiserslautern, 67663, Kaiserslautern, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 21, 2021
PubMed
Summary

Spin Hamiltonian parameters for osmium-nickel cyanometallate complexes were calculated using advanced ab initio methods. These parameters accurately reproduce experimental data, providing insights into magnetic materials synthesis.

Keywords:
ab initio calculationsanisotropic exchangemagnetic propertiesnegative g valueosmium

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Area of Science:

  • Inorganic Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Accurate spin Hamiltonian parameters are crucial for understanding magnetic properties of molecular materials.
  • Previous experimental fits for pentanuclear Os-Ni cyanometallate complexes yielded unsatisfactory parameters.
  • Osmium-cyanido-nickel complexes serve as versatile building blocks for advanced magnetic materials.

Purpose of the Study:

  • To derive accurate spin Hamiltonian parameters for a pentanuclear Os-Ni cyanometallate complex.
  • To validate computational methods against experimental magnetic susceptibility data.
  • To provide reliable parameters for the design of novel magnetic materials.

Main Methods:

  • Ab initio wave function based calculations, specifically valence-type complete active space configuration interaction including spin-orbit interaction (CASOCI).
  • Single-step procedure for deriving one-centre and two-centre spin Hamiltonian parameters.
  • Comparison and scaling of calculated exchange interactions with experimental magnetic data.

Main Results:

  • Calculated spin Hamiltonian parameters accurately reproduce experimental data with reasonable magnitudes.
  • One-centre parameters are within expected ranges; anisotropic exchange for Os-Ni pairs is significant.
  • Isotropic and anisotropic exchange parameters were determined after scaling CASOCI results by a factor of 2.5.
  • A negative g-value for Os centers, arising from strong spin-orbit interaction, explains the observed magnetic behavior.

Conclusions:

  • The study successfully derived accurate spin Hamiltonian parameters for the target complex.
  • The findings validate the CASOCI method for predicting magnetic interactions in osmium-containing systems.
  • The obtained parameters are vital for the rational synthesis of new osmium/nickel-based magnetic materials.