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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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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Ionic Bonding and Electron Transfer02:48

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. 
41.9K
Structures of Solids02:22

Structures of Solids

14.4K
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...
14.4K
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Nanostructural Organization in a Biredox Ionic Liquid.

Roxanne Berthin1,2, Alessandra Serva1,2, Olivier Fontaine3,4

  • 1Sorbonne Université, CNRS, Physico-chimie des Électrolytes et Nanosystèmes Interfaciaux, PHENIX, F-75005 Paris, France.

The Journal of Physical Chemistry Letters
|December 27, 2022
PubMed
Summary
This summary is machine-generated.

This study reveals the nanostructure of biredox ionic liquids, showing TEMPO groups aggregate and anthraquinone groups stack. This structural insight explains enhanced performance in supercapacitors.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Ionic liquids exhibit unique structures influencing physical properties like domain formation.
  • Biredox ionic liquids with anthraquinone and TEMPO redox groups enhance supercapacitor performance.
  • The nanostructure of these biredox ionic liquids remains uncharacterized.

Purpose of the Study:

  • To investigate the nanostructuration of biredox ionic liquids.
  • To elucidate the structural basis for enhanced supercapacitor performance.

Main Methods:

  • Polarizable molecular dynamics simulations were employed.
  • Analysis focused on the self-assembly and arrangement of redox functional groups.

Main Results:

  • TEMPO nitroxyl functions show a tendency to aggregate.
  • Anthraquinone groups favor parallel stacked arrangements.
  • Anthraquinone stacking eventually percolates throughout the ionic liquid.

Conclusions:

  • The observed nanostructuration provides mechanistic insights into biredox ionic liquid behavior in supercapacitors.
  • Understanding these structures can guide the design of improved energy storage materials.