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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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Ionic Radii03:10

Ionic Radii

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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...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.7K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.8K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.1K
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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Structural Design of Ionic Liquids for Optimizing Aromatic Dissolution.

Haihui Joy Jiang1, Silvia Imberti2, Blake A Simmons3,4

  • 1School of Chemistry and Sydney Nano Institute, The University of Sydney, NSW, 2006, Australia.

Chemsuschem
|October 10, 2018
PubMed
Summary
This summary is machine-generated.

Protic ionic liquids (PILs) can efficiently extract aromatic compounds. Neutron diffraction revealed that local geometry and polar group interactions, not just nanostructure, dictate solute solubility in PILs.

Keywords:
ionic liquidsnanostructuresneutron scatteringnoncovalent interactionssolvents

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Protic ionic liquids (PILs) show promise as cost-effective, high-efficiency solvents for aromatic compound extraction.
  • Understanding PILs' atomic-level design features is crucial for optimizing selectivity in processing aromatic compounds like guaiacol.

Purpose of the Study:

  • To elucidate the key structural determinants of PILs governing solubility selectivity for aromatic solutes.
  • To establish a framework for designing PILs to enhance the dissolution of small aromatic species.

Main Methods:

  • Neutron diffraction was employed to compare the bulk structure of two PILs.
  • The study analyzed PIL structures with and without the aromatic solute guaiacol (2-methoxyphenol).

Main Results:

  • Amphiphilic nanostructure is vital for dissolving nonpolar solute moieties.
  • Local geometry and competitive interactions among polar groups (cation, anion, solute) significantly impact solvation.
  • These factors collectively influence the overall solubility and selectivity of PILs.

Conclusions:

  • PILs' solvation capabilities depend on a complex interplay of nanostructure, local geometry, and polar group interactions.
  • A design framework is proposed to minimize competition and maximize driving forces for dissolving aromatic compounds.
  • This research aids in developing tailored PILs for efficient biomass processing and chemical synthesis.