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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

591
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
591
Chemical and Solubility Equilibria02:21

Chemical and Solubility Equilibria

4.1K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if  ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
4.1K
Solubility Equilibria03:07

Solubility Equilibria

52.0K
Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
52.0K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

62.4K
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.
62.4K
Solubility Equilibria: Overview01:09

Solubility Equilibria: Overview

584
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
584
Solvating Effects02:12

Solvating Effects

7.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.3K

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Related Experiment Video

Updated: May 30, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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Chatbot-assisted quantum chemistry for explicitly solvated molecules.

Rohit S K Gadde1, Sreelaya Devaguptam1, Fangning Ren1

  • 1Department of Chemistry, Emory University Atlanta GA 30322 USA fang.liu@emory.edu.

Chemical Science
|January 31, 2025
PubMed
Summary
This summary is machine-generated.

AutoSolvateWeb is a new platform that uses a chatbot and cloud computing to make complex molecular simulations accessible to more chemists. This advanced computational chemistry tool democratizes sophisticated research without specialized hardware.

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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Area of Science:

  • Computational Chemistry
  • Molecular Simulations
  • Quantum Chemistry

Background:

  • Advanced computational chemistry software packages leverage quantum chemistry and molecular simulations.
  • Complex design and specialized hardware hinder broad adoption in the chemistry community.

Purpose of the Study:

  • Introduce AutoSolvateWeb, a chatbot-assisted platform to simplify computational chemistry.
  • Enable non-experts to configure and execute complex quantum mechanical/molecular mechanical (QM/MM) simulations.

Main Methods:

  • User-friendly chatbot interface guides users through simulation setup.
  • Cloud infrastructure eliminates hardware configuration challenges.
  • Integration of virtual agents and cloud computing for accessibility.

Main Results:

  • AutoSolvateWeb successfully guides users through complex QM/MM simulations.
  • Platform operates on cloud infrastructure, removing hardware barriers.
  • Demonstrates democratization of sophisticated computational research tools.

Conclusions:

  • Combining virtual agents with cloud computing democratizes access to advanced computational tools.
  • AutoSolvateWeb simplifies complex simulations for a broader chemistry audience.
  • Reduces the need for specialized hardware and expertise in computational chemistry.