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Chemical Shift: Internal References and Solvent Effects01:17

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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.
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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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Chemical and Solubility Equilibria02:21

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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,...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Preparation of Binary and Ternary Deep Eutectic Systems
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Translational and reorientational dynamics in deep eutectic solvents.

D Reuter1, P Münzner2, C Gainaru2

  • 1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany.

The Journal of Chemical Physics
|April 23, 2021
PubMed
Summary
This summary is machine-generated.

Deep eutectic solvents (DESs) like glyceline, ethaline, and reline exhibit distinct dynamic behaviors. While glyceline and ethaline show coupled ionic and molecular motions, reline displays decoupled charge transport, challenging previous models.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Deep eutectic solvents (DESs) are gaining attention as versatile materials.
  • Understanding their dynamic properties is crucial for applications.
  • Previous models suggested a 'revolving-door' mechanism for charge transport in DESs.

Purpose of the Study:

  • To investigate the rheological and dielectric properties of common DESs (glyceline, ethaline, reline).
  • To compare the temperature dependence of viscosity, relaxation times, and ionic conductivity.
  • To elucidate the relationship between ionic and molecular dynamics in DESs.

Main Methods:

  • Rheological measurements across a wide temperature and dynamic range.
  • Broadband dielectric spectroscopy to determine relaxation times and conductivity.
  • Analysis using the random free-energy barrier hopping model.

Main Results:

  • Mechanical compliance spectra fit the random free-energy barrier hopping model.
  • Dielectric spectra show contributions from reorientational dynamics.
  • Glyceline and ethaline exhibit coupled translational and reorientational motions.
  • Reline shows decoupled ionic transport from structural dynamics, following a fractional Walden rule.
  • Ionic conductivity in reline is enhanced at low temperatures.

Conclusions:

  • The study reveals distinct dynamic behaviors in different DESs.
  • Coupled ionic and molecular motions are observed in glyceline and ethaline.
  • Decoupled ionic transport in reline suggests alternative charge transport mechanisms.
  • The findings do not support the revolving-door mechanism for charge transport in these DESs.