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Related Concept Videos

NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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NMR Spectroscopy of Benzene Derivatives01:34

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
11.1K
NMR Spectroscopy: Chemical Shift Overview01:15

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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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NMR and Mass Spectroscopy of Carboxylic Acids01:30

NMR and Mass Spectroscopy of Carboxylic Acids

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In ¹H NMR spectroscopy, acidic protons (–COOH) of carboxylic acids are highly deshielded and absorb far downfield, at around 9–12 ppm. The chemical shift value depends on the concentration and solvent used.
While α protons of carboxylic acids absorb at 2–2.5 ppm, β protons absorb further upfield.
Carboxylic acids are easily identified by dissolving them in deuterium oxide, which results in a rapid exchange of the acidic protons with deuterium. This leads to the...
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High-Resolution 17O NMR Spectroscopy of Structural Water.

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Researchers used advanced 17O solid-state NMR spectroscopy to distinguish four unique water molecule environments in lanthanum magnesium nitrate hydrate crystals. This technique reveals detailed insights into water

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Area of Science:

  • Solid-state inorganic chemistry
  • Materials science
  • Spectroscopy

Background:

  • Understanding water molecule interactions in crystalline structures is crucial.
  • Structurally similar water molecules often exhibit complex binding environments.
  • Distinguishing these environments is key to characterizing hydrated materials.

Purpose of the Study:

  • To resolve and characterize distinct bound water environments in lanthanum magnesium nitrate hydrate.
  • To demonstrate the capability of 17O solid-state NMR spectroscopy for site-specific analysis of water molecules.
  • To investigate the unique electronic environments of water molecules within a single hydrated crystal.

Main Methods:

  • Utilized high-resolution, multidimensional 17O solid-state NMR spectroscopy.
  • Conducted experiments at high magnetic fields (18.8-35.2 T).
  • Analyzed quadrupole coupling constants and asymmetry parameters for 17O nuclei.

Main Results:

  • Successfully resolved four distinct bound water environments within the crystal structure.
  • Determined 17O quadrupole coupling constants ranging from 6.6 to 7.1 MHz.
  • Determined 17O asymmetry parameters ranging from 0.83 to 0.90.

Conclusions:

  • 17O solid-state NMR spectroscopy effectively distinguishes unique water environments in hydrated crystals.
  • The study demonstrates high-resolution capabilities for analyzing water molecule interactions at the atomic level.
  • This method provides a powerful tool for deciphering the electronic environments of structural water.