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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
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...
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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...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
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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Crystal Field Theory - Octahedral Complexes02:58

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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.
CFT focuses on...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

42.4K
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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Crystal structures of protic ionic liquids.

Michael P Hassett1, Jack Binns1, Stuart J Brown1

  • 1School of Science, College of STEM, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.

The Journal of Chemical Physics
|July 1, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals the crystal structures of protic ionic liquids (PILs), finding they form either hydrogen-bonded networks or lamellar structures. Understanding these solid-state arrangements is key to unlocking PIL applications.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Crystallography

Background:

  • Protic ionic liquids (PILs) possess unique properties due to their hydrogen-bonding capabilities, making them valuable for catalysis, energy storage, and separations.
  • PILs often exist as amorphous solids, hindering the exploration of their crystalline structures and solid-state properties.

Purpose of the Study:

  • To investigate the crystal structures and phase behavior of alkylammonium-based protic ionic liquids.
  • To identify structural patterns and understand the factors influencing PIL crystallization.

Main Methods:

  • Synchrotron X-ray powder diffraction was employed to analyze 24 alkylammonium-based PILs.
  • Crystallization and full structure determination were performed for select PILs.

Main Results:

  • Eighteen of the 24 PILs were successfully crystallized, with five yielding full crystal structures.
  • The crystalline structures were categorized into two main types: those dominated by hydrogen-bonded networks and those exhibiting lamellar arrangements with distinct hydrophobic and hydrophilic regions.
  • The bonding observed in the crystalline phase mirrored that of the liquid state for both structural types.

Conclusions:

  • The study successfully characterized the crystalline structures of several PILs, overcoming challenges associated with their amorphous nature.
  • Two primary structural motifs were identified in crystalline PILs, providing insights into their solid-state organization.
  • This work establishes a foundation for future research into the crystallography and applications of protic ionic liquids.