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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

24.5K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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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...
68.1K
Polyprotic Acids03:38

Polyprotic Acids

31.5K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
31.5K
Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

6.6K
Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Ionic Dynamics of Hydroxylammonium Ionic Liquids: A Classical Molecular Dynamics Simulation Study.

Th Dhileep N Reddy1, Bhabani S Mallik1

  • 1Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, 502285 Sangareddy, Telangana, India.

The Journal of Physical Chemistry. B
|May 27, 2020
PubMed
Summary
This summary is machine-generated.

Molecular dynamics simulations reveal how hydroxyalkyl chains affect ionic liquid (IL) dynamics. Tris-(2-hydroxyethyl) ammonium formate (THEF) exhibits slower dynamics due to increased hydroxyl groups and cation bulkiness, impacting ionic conductivity.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Ionic liquids (ILs) are versatile materials with tunable properties.
  • Understanding the structure-dynamics relationship in ILs is crucial for their application.
  • Previous studies have explored IL dynamics, but a detailed analysis of hydroxyl group effects is needed.

Purpose of the Study:

  • To investigate the structure and dynamics of four specific ionic liquids using molecular dynamics simulations.
  • To elucidate the influence of hydroxyalkyl chains and hydroxyl groups on IL dynamics and ionic conductivity.
  • To compare simulation results with experimental trends for validation.

Main Methods:

  • Classical molecular dynamics (MD) simulations were employed.
  • Analysis included mean squared displacements (MSDs), velocity autocorrelation functions (VACFs), and current auto-correlation functions (CACFs).
  • Radial distribution functions (RDFs), spatial distribution functions (SDFs), and hydrogen bond dynamics were calculated.

Main Results:

  • Diffusion coefficients calculated from VACFs were higher than those from MSDs.
  • Averaged diffusion coefficients were used to calculate uncorrelated ionic conductivities (ICs), showing agreement with experimental trends.
  • Increased hydroxyalkyl chains and hydroxyl groups on cations led to slower dynamics, with tris-(2-hydroxyethyl) ammonium formate (THEF) exhibiting the slowest diffusion.
  • Coordination numbers decreased with increasing cation bulkiness due to steric hindrance.
  • Anions were found to occupy spaces around ammonium hydrogen atoms.
  • Ion-pair and ion-cage lifetimes showed a linear relationship with ICs.

Conclusions:

  • The number of hydroxyl groups and the bulkiness of cations significantly influence IL dynamics and ionic conductivity.
  • THEF demonstrates slower dynamics compared to other studied ILs, consistent with structural and dynamic analyses.
  • MD simulations provide valuable insights into the molecular mechanisms governing IL behavior and properties.