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Related Concept Videos

Chemical Equilibria: Systematic Approach to Equilibrium Calculations01:21

Chemical Equilibria: Systematic Approach to Equilibrium Calculations

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Equilibrium calculations for systems involving multiple equilibria are often complex. For example, to calculate the solubility of a sparingly soluble salt in an aqueous solution in the presence of a common ion, one must consider all the equilibria in this solution. Calculations for these systems can be complicated and tedious, so a systematic approach with a series of steps is often helpful. The process is detailed below.
The first step is to identify all the chemical reactions involved, The...
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Reaction Quotient02:35

Reaction Quotient

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The status of a reversible reaction is conveniently assessed by evaluating its reaction quotient (Q). For a reversible reaction described by m A + n B ⇌ x C + y D, the reaction quotient is derived directly from the stoichiometry of the balanced equation as
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Molecular and Ionic Solids02:54

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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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
66.2K
Ionic Association01:28

Ionic Association

205
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Electrochemical Systems01:24

Electrochemical Systems

166
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Updated: Apr 21, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Simulating chemical reactions in ionic liquids using QM/MM methodology.

Orlando Acevedo1

  • 1Department of Chemistry and Biochemistry, Auburn University , Auburn, Alabama 36849, United States.

The Journal of Physical Chemistry. A
|October 21, 2014
PubMed
Summary
This summary is machine-generated.

Ionic liquids enhance chemical reactions by altering mechanisms. Mixed quantum and molecular mechanical (QM/MM) methods reveal the molecular interactions responsible for these "ionic liquid effects" in various organic syntheses.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Organic Synthesis

Background:

  • Ionic liquids (ILs) are increasingly used as reaction media, showing potential to alter reaction mechanisms compared to conventional solvents.
  • Despite their growing application in catalysis and organic synthesis, the molecular underpinnings of ILs' chemical impact remain poorly understood.
  • Understanding these solvent effects is crucial for optimizing reactions and designing new synthetic strategies.

Purpose of the Study:

  • To elucidate the microscopic details of how ionic liquids influence reaction rates and mechanisms.
  • To characterize the solute-solvent interactions responsible for experimentally observed 'ionic liquid effects'.
  • To review the development and application of mixed quantum and molecular mechanical (QM/MM) methodologies for studying ILs.

Main Methods:

  • Development and application of mixed quantum and molecular mechanical (QM/MM) methodology with explicit solvent representation.
  • Calculation of medium dependence of activation barriers for key organic reactions.
  • Atomic-level characterization of solute-solvent interactions.
  • Technical advancements including linear-scaling electrostatics, polynomial fitting for proton transfer, and a custom IL force field (OPLS-AA).

Main Results:

  • QM/MM simulations provided detailed insights into the microscopic behavior of ionic liquids as reaction media.
  • The study characterized specific solute-solvent interactions driving rate enhancements and mechanistic changes.
  • Methodological improvements were presented for more efficient and accurate simulations of ionic liquid systems.

Conclusions:

  • Mixed QM/MM methodology is effective for understanding the molecular basis of ionic liquid effects in chemical reactions.
  • Explicit solvent models are essential for capturing the nuances of ionic liquid-mediated catalysis and synthesis.
  • The developed computational tools and force fields enable further exploration of ionic liquids in diverse chemical processes.