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Ionic Crystal Structures

Ionic Crystal Structures

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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

Valence Bond Theory

Valence Bond Theory

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...

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

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.
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Related Experiment Video

Updated: Jun 21, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

Octahedral Fe3O4 nanoparticles and their assembled structures.

Luhui Zhang¹, Jiajia Wu, Hanbin Liao

¹Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China.

Chemical Communications (Cambridge, England)

|July 15, 2009

Summary

This summary is machine-generated.

Synthesized octahedral iron(3) oxide (Fe3O4) nanoparticles exhibit ferrimagnetic properties. Their uniform size and shape allow them to self-assemble into ordered superlattices.

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Area of Science:

Materials Science
Nanotechnology
Magnetism

Background:

Iron(3) oxide (Fe3O4) nanoparticles are of interest due to their magnetic properties.
Controlling nanoparticle size, shape, and assembly is crucial for advanced applications.

Purpose of the Study:

To synthesize monodisperse, octahedral Fe3O4 nanoparticles.
To investigate the self-assembly behavior of these nanoparticles into superlattices.
To characterize the magnetic properties and structural orientation of the assembled superlattices.

Main Methods:

Facile synthesis route for octahedral Fe3O4 nanoparticles.
Characterization of nanoparticle size, shape, and monodispersity.
Analysis of nanoparticle self-assembly into superlattices.
Investigation of magnetic properties (ferrimagnetism) and superlattice orientation.

Main Results:

Successfully synthesized monodisperse, octahedral Fe3O4 nanoparticles.
Observed self-assembly of nanoparticles into ordered superlattices with well-defined orientation.
Confirmed ferrimagnetic behavior of the synthesized nanoparticles.

Conclusions:

The facile synthesis route enables the production of Fe3O4 nanoparticles suitable for self-assembly.
Monodispersity and anisotropic shape are key factors driving the formation of oriented superlattices.
The resulting superlattices possess tunable magnetic and structural properties.