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Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
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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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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Updated: Aug 19, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Published on: March 24, 2018

Collective Effects in Ionic Liquid [emim][Tf2N] and Ionic Paramagnetic Nitrate Solutions without Long-Range

Eni Kume¹, Nicolas Martin¹, Peter Dunne²

¹Laboratoire Léon Brillouin (CEA-CNRS), Université Paris-Saclay, CEDEX, 91191 Gif-sur-Yvette, France.

Molecules (Basel, Switzerland)

|November 26, 2022

Summary

This summary is machine-generated.

Ordinary liquids exhibit shear elasticity, a property also found in ionic liquids and nitrate solutions. These fluids resist shear stress, demonstrating collective effects under mechanical or magnetic fields.

Keywords:

ionic liquids mechanical measurements neutron scattering shear elasticity

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Area of Science:

Rheology
Condensed Matter Physics
Physical Chemistry

Background:

Mesoscopic shear elasticity has been observed in ordinary liquids.
This phenomenon is explained by reinforcing liquid/surface interfacial energy and nonextensive theoretical models.
Elastic effects are being investigated in small molecules with strong electrostatic interactions.

Purpose of the Study:

To examine shear elasticity in room temperature ionic liquids (RTILs) like [emim][Tf2N] and paramagnetic nitrate solutions.
To determine if these charged fluids exhibit nonzero low-frequency shear elasticity.
To understand the influence of magnetic properties on the structure of paramagnetic nitrate solutions.

Main Methods:

Experimental investigation of shear elasticity at the submillimeter scale.
Dynamic mechanical analysis (DMA).
Neutron scattering studies.

Main Results:

Room temperature ionic liquids and nitrate solutions exhibit nonzero low-frequency shear elasticity.
These charged fluids demonstrate resistance to shear stress.
Neutron scattering confirmed that magnetic properties do not induce structural formation in the paramagnetic nitrate solution.

Conclusions:

Elastic correlations in liquids contribute to collective effects under external stress.
This applies to both mechanical and magnetic fields, even in liquids not near phase transitions.
Shear elasticity is a significant property in ionic liquids and paramagnetic solutions.