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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Valence Bond Theory02:42

Valence Bond Theory

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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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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
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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MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Updated: May 28, 2025

Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Highly Efficient Numerical Method for Modeling Mofs Containing Transition Metal Ions.

D D Raenko1, A L Tchougreeff1

  • 1A. N. Frumkin Institute of Physical Chemistry of RAS, Moscow, Russia.

Journal of Computational Chemistry
|February 12, 2025
PubMed
Summary
This summary is machine-generated.

A new computational tool, Seethoo, accurately models metal-organic frameworks (MOFs) with transition metal ions. It efficiently calculates electronic properties like spin state transitions and charge distributions in MOFs.

Keywords:
MOFsgroup function formalismsemi‐empirical modelingsensory functionalityspin crossovertransition metal ions

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Area of Science:

  • Computational Chemistry
  • Materials Science

Background:

  • Metal-organic frameworks (MOFs) are advanced materials with tunable properties.
  • Accurate modeling of transition metal ions (TMIs) within MOFs is crucial for understanding their behavior.

Purpose of the Study:

  • To introduce and validate a new computational program package, Seethoo.
  • To assess Seethoo's capability in modeling MOFs containing TMIs with open d-shells.

Main Methods:

  • Development of the Seethoo program package using a group-function based semiempirical approach.
  • Application of Seethoo to calculate electronic properties for various MOFs and MOF-like systems.

Main Results:

  • Seethoo accurately computes d-shell low-spin (LS)-high-spin (HS) gaps and charge distributions in MOFs.
  • Calculations for Mn, Fe, Co, and Ni containing MOFs show reasonable agreement with experimental data.
  • Mössbauer spectral parameters were computed for Fe-containing systems.

Conclusions:

  • The Seethoo package demonstrates significant potential for accurate and efficient modeling of MOFs.
  • This tool can aid in the design and understanding of MOFs for various applications.