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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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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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NMR Spectroscopy of Aromatic Compounds01:14

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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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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...
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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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Small angle double quantum spectroscopy (SAQS NMR).

Peyman Sakhaii1, Bojan Bohorc1, Wolfgang Bermel2

  • 1NMR Laboratory of SANOFI, C&BD (Chemistry & Biotechnology Development Frankfurt Chemistry), Industriepark Hoechst, Building G849, D-65926 Frankfurt/Main, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 16, 2018
PubMed
Summary
This summary is machine-generated.

A new Small Angle double Quantum Spectroscopy (SAQS NMR) experiment enhances double quantum NMR spectroscopy. This method suppresses unwanted peaks and broadens the detectable J-coupling range for clearer spectral analysis.

Keywords:
Broadband homodecouplingDouble quantumInadequateJ resolved spectroscopyRemote peak suppressionTILT

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Spectroscopy
  • Physical Chemistry

Background:

  • Double Quantum (DQ) NMR spectroscopy is a powerful technique for analyzing complex spin systems.
  • Traditional DQ NMR experiments can suffer from limitations such as remote peak interference and a narrow detectable J-coupling range.

Purpose of the Study:

  • To introduce a novel 2D DQ NMR experiment, Small Angle double Quantum Spectroscopy (SAQS NMR), for improved spectral resolution and sensitivity.
  • To suppress the appearance of remote peaks and expand the range of J values detectable.

Main Methods:

  • Implementation of a small flip angle for double quantum excitation and reconversion to minimize remote peaks.
  • Application of band-selective decoupling during the preparation period to simplify complex spin networks.
  • Incorporation of an ACCORDION element to increment the J evolution delay synchronously with the t1 period.
  • Development of a broadband homodecoupled version of the DQ experiment.

Main Results:

  • The 2D DQ NMR experiment provides phase-sensitive spectra with double quantum frequencies in F1.
  • Suppression of remote peaks was achieved through small flip angle excitation and reconversion.
  • The ACCORDION element enabled the excitation of double quantum coherence over a wider range of J values.
  • The broadband homodecoupled version yields correlation peaks with singlet response at F2 chemical shifts and double quantum frequencies in F1.

Conclusions:

  • SAQS NMR offers a significant advancement in double quantum spectroscopy, providing enhanced spectral quality.
  • The developed techniques effectively address limitations of previous DQ NMR methods, enabling more detailed molecular analysis.