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Related Concept Videos

Ionic Bonds00:42

Ionic Bonds

128.8K
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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Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

35.1K
Bond Polarity
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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. 
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Ionic Crystal Structures02:42

Ionic Crystal Structures

16.8K
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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Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

36.3K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
36.3K
Formation of Complex Ions03:45

Formation of Complex Ions

25.7K
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...
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Ion dynamics in hexagonal boron nitride ionogel electrolytes.

Giselle de Araujo Lima E Souza1, Moises Acero1, Emilia Pelegano-Titmuss1

  • 1Department of Physics, Hunter College, CUNY, New York, New York 10065, USA.

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Hexagonal boron nitride (hBN) ionogels show promise for energy storage. Advanced nuclear magnetic resonance (NMR) reveals how hBN influences ion movement and interactions, crucial for electrolyte design.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Ionogel electrolytes with hexagonal boron nitride (hBN) nanoplatelets are advanced materials for energy storage.
  • Understanding ion transport at the molecular level in these hBN-ionogels is limited.

Purpose of the Study:

  • To investigate the molecular dynamics of ionic species in hBN-ionogels using advanced nuclear magnetic resonance (NMR) techniques.
  • To elucidate the role of hBN and lithium salts in modulating ion transport and relaxation mechanisms.

Main Methods:

  • Utilized diffusion and relaxation nuclear magnetic resonance (NMR) techniques.
  • Employed fast-field cycling (FFC) NMR across a broad frequency range (30 kHz to 500-800 MHz).
  • Investigated proton (1H), fluorine-19 (19F), and lithium-7 (7Li) relaxation profiles and diffusion.

Main Results:

  • hBN significantly influences molecular rotation and translation, affecting 1H and 19F relaxation.
  • Lithium ions (Li+) enhance anion mobility at the hBN interface.
  • 7Li relaxation detected strong hBN surface interactions missed by diffusion NMR.

Conclusions:

  • A broad frequency range in NMR is essential for studying ionogels.
  • hBN plays a critical role in ion dynamics and interfacial behavior.
  • Findings provide insights for designing optimized hBN-ionogel electrolytes for energy storage.