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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...

Ions and Ionic Charges

Ions and Ionic Charges

In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...

Ions as Acids and Bases

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:

Lewis Structures of Molecular Compounds and Polyatomic Ions

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:

Ionic Radii

Ionic Radii

Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Updated: Feb 8, 2026

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

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

Published on: March 24, 2018

Structure and Ion Dynamics in Imidazolium-Based Protic Organic Ionic Plastic Crystals.

Haijin Zhu^1,2, Xiaoen Wang^1,2, R Vijayaraghava³

¹Institute for Frontier Materials , Deakin University , Geelong , Victoria 3216 , Australia.

The Journal of Physical Chemistry Letters

|June 29, 2018

Summary

Designing organic ionic plastic crystals (OIPCs) requires understanding their structure and dynamics. Subtle cation changes significantly alter thermal behavior, crystal structure, and ion conduction mechanisms in these materials.

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Published on: December 20, 2016

Area of Science:

Materials Science
Solid-State Chemistry
Electrochemistry

Background:

Organic ionic plastic crystals (OIPCs) are promising for advanced applications.
Rational design of OIPCs requires understanding their structure-property relationships.
Current research often focuses on cation/anion chemistry optimization.

Purpose of the Study:

Investigate the solid-state structure and ion dynamics of imidazolium-based protic OIPCs.
Analyze the ion-transport properties of these OIPC compounds.
Elucidate the impact of subtle cation modifications on material properties.

Main Methods:

Differential Scanning Calorimetry (DSC)
Electrical conductivity measurements
Nuclear Magnetic Resonance (NMR) spectroscopy
Synchrotron X-ray diffraction studies

Main Results:

Subtle changes in cation chemistry led to significant differences in thermal phase behavior.
Crystalline structures and ion conduction mechanisms varied substantially between the studied OIPCs.
Microstructural features were found to critically influence ion transport rates and pathways.

Conclusions:

OIPC design benefits from a fundamental understanding of structure and dynamics.
Cation chemistry modifications profoundly impact thermal and structural properties.
Microstructure plays a crucial role in ion transport, complementing cation/anion optimization.