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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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Molecular and Ionic Solids

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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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Ionic Bonding and Electron Transfer

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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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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Increasing Cation Ion Symmetry Reduces Ionic Liquid Ordering in Thin Films.

Michael Blake Van Den Top1, Andrew Horvath1, Spyridon Koutsoukos2

  • 1Department of Chemistry, University of Iowa, Iowa, Iowa 52242, United States.

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Ionic liquid asymmetry does not drive ordering in spherical cation systems. These ionic liquids maintain an isotropic state, even under confinement, challenging previous hypotheses about their structural organization.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Ionic liquids (ILs) exhibit complex self-organization near surfaces and in bulk.
  • The driving forces behind IL structural ordering remain poorly understood.
  • Hypotheses suggest molecular asymmetry in ILs contributes to observed ordering.

Purpose of the Study:

  • To investigate the role of ionic liquid asymmetry in promoting ordered structures.
  • To test if ILs with spherical cations exhibit ordering.
  • To understand the fundamental factors governing IL organization.

Main Methods:

  • Synthesized ionic liquids with spherical cations: tetraoctylphosphonium ([P8888]) and tetra(propoxymethyl)phosphonium [P(3O1)4].
  • Paired spherical cations with tetracyanoborate ([B(CN)4]) anion.
  • Utilized infrared spectroscopy to analyze the structural ordering of IL films.

Main Results:

  • Ionic liquids composed of spherical cations showed minimal evidence of ordered structures.
  • Infrared signatures indicated a lack of significant ordering.
  • The ILs maintained an isotropic environment, even when confined to micrometer-scale dimensions.

Conclusions:

  • Ionic liquid asymmetry is not the sole or primary driver for ordering in all IL systems.
  • Spherical cation-based ILs, contrary to some hypotheses, do not readily form ordered structures.
  • The findings suggest that specific molecular architectures are crucial for IL self-organization.