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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...

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.

Ionic Compounds: Formulas and Nomenclature

Ionic Compounds: Formulas and Nomenclature

An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.

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...

Formation of Complex Ions

Formation of Complex Ions

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...

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:

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Updated: May 26, 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

Ionic structures of nanobased FeCl3/[C4mim]Cl ionic liquids.

Ji-Guang Li¹, Yu-Feng Hu, Shu-Feng Sun

¹State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior & Property Research Laboratory, China University of Petroleum, Beijing 102249, China.

The Journal of Physical Chemistry. B

|December 30, 2011

Summary

This study reveals the ionic species present in iron(III) chloride with 1-butyl-3-methylimidazolium chloride ionic liquids. Researchers identified [FeCl(4)](-) and [Fe(2)Cl(7)](-) species and observed nanostructures.

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

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Published on: February 5, 2022

Area of Science:

Materials Science
Physical Chemistry
Ionic Liquids

Background:

Ionic liquids (ILs) are salts that are liquid at ambient temperatures.
Iron(III) chloride ([FeCl(3)])-based ILs are of interest due to their unique properties.
Understanding the speciation and structure of these ILs is crucial for their applications.

Purpose of the Study:

To characterize the ionic species in FeCl(3)/[C(4)mim]Cl ionic liquids.
To investigate the temperature dependence of these species.
To explore the nanostructure of these ionic liquids.

Main Methods:

Raman spectroscopy was used to analyze ionic species.
Infrared spectroscopy and thermodynamic properties were also measured.
Freeze-fracture transmission electron microscopy (FFTEM) was employed to observe nanostructures.

Main Results:

The presence of [FeCl(4)](-) was confirmed when FeCl(3)/[C(4)mim]Cl mole ratio < 1.
[Fe(2)Cl(7)](-) was identified when FeCl(3) was in excess.
Temperature variations affected the symmetry vibrations of [Fe(2)Cl(7)](-), and nanostructures of tens of nanometers were observed.

Conclusions:

The study elucidated the formation of [FeCl(4)](-) and [Fe(2)Cl(7)](-) in FeCl(3)/[C(4)mim]Cl ionic liquids.
Interionic interaction strength was found to vary based on the ratio of components.
The first observation of nanostructures in these ILs using biological imaging was achieved.