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Molecular and Ionic Solids

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

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...

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....

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...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

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...

Crystal Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...

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Related Experiment Video

Updated: Jul 3, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Published on: January 9, 2014

Correction: Single crystal formation in core-shell capsules.

Marie Mettler¹, Adrien Dewandre¹, Nikolay Tumanov²

¹Secoya Technologies Fond des Més 4, Louvain-la-Neuve 1348, Belgium. jean.septavaux@secoya-tech.com.

Chemical Communications (Cambridge, England)

|March 12, 2025

Summary

This summary is machine-generated.

This correction clarifies details regarding single crystal formation within core-shell capsules. It ensures accurate reporting of experimental findings in materials science research.

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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

Area of Science:

Materials Science
Crystallography
Nanotechnology

Context:

Previous research explored single crystal formation in core-shell capsules.
Accurate data presentation is crucial for scientific reproducibility.

Purpose:

To correct inaccuracies in the original publication.
To provide precise information on crystal formation mechanisms.

Summary:

The correction addresses specific details related to the formation of single crystals within core-shell capsule structures.
It rectifies minor errors in the original experimental description and data interpretation.

Impact:

Ensures the integrity and reliability of scientific literature.
Facilitates accurate understanding of crystal growth in confined environments.
Supports further research in nanomaterials and capsule-based systems.