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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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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Intermolecular vs Intramolecular Forces

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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Related Experiment Video

Updated: Jun 9, 2025

Methane Hydrate Crystallization on Sessile Water Droplets
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Electric Field Influence on CO Clathrate Hydrates.

Smita Rai1, Dhurba Rai1

  • 1Department of Physics, Sikkim University, Samdur, East Sikkim 737102, India.

The Journal of Physical Chemistry. A
|October 23, 2024
PubMed
Summary

Carbon monoxide (CO) in clathrate hydrate cages responds to electric fields. Calculations suggest these fields may induce CO release from hydrate structures.

Area of Science:

  • Computational chemistry
  • Materials science
  • Physical chemistry

Background:

  • Clathrate hydrates are crystalline solids trapping guest molecules within cage-like structures.
  • Carbon monoxide (CO) can be encapsulated within specific clathrate hydrate cages, influencing their properties.
  • Understanding guest-host interactions is crucial for applications in gas storage and separation.

Purpose of the Study:

  • To investigate the behavior of carbon monoxide (CO) confined within sI and sII clathrate hydrate cages.
  • To analyze the effects of external electric fields on CO-occupied clathrate cages.
  • To assess the stability of these structures and the potential for field-induced CO release.

Main Methods:

  • Density functional theory (DFT)-based computational calculations were employed.

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  • Simulations focused on sI and sII clathrate hydrate cage structures containing CO.
  • Analysis included geometrical parameters, dipole moment, HOMO-LUMO gap, and vibrational frequency shifts under electric fields.

    • Main Results:

    • Applied electric fields induced changes in the geometrical parameters and dipole moment of the CO-clathrate cage system.
    • The HOMO-LUMO gap and vibrational frequencies of confined CO showed sensitivity to electric field strength.
    • Calculations indicated a potential for electric fields to destabilize the cages, suggesting a mechanism for CO release.

    Conclusions:

    • Electric fields significantly influence the electronic and structural properties of CO within clathrate hydrate cages.
    • The observed changes provide insights into the stability of these systems under external stimuli.
    • This study highlights the possibility of controlling guest molecule release from clathrate hydrates using electric fields.