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Related Concept Videos

NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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 broad and...
¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

A dedicated spectrometer for dissolution DNP NMR spectroscopy.

James Leggett1, Robert Hunter, Josef Granwehr

  • 1Sir Peter Mansfield Magnetic Resonance Centre, School of Physics & Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.

Physical Chemistry Chemical Physics : PCCP
|May 12, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel dual-isocenter magnet for dynamic nuclear polarization (DNP) NMR. This setup minimizes polarization loss, overcoming limitations of previous hyperpolarization methods for faster, more sensitive NMR spectroscopy.

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Physical Chemistry
  • Spectroscopic Techniques

Background:

  • Dynamic nuclear polarization (DNP) enhances nuclear spin polarization for NMR.
  • Current DNP methods require solute transfer between magnets, limiting applications to systems with long relaxation times.

Purpose of the Study:

  • To design and construct a dedicated spectrometer for DNP applications.
  • To overcome the limitations of existing DNP-enhanced NMR techniques.

Main Methods:

  • A novel spectrometer design featuring a dual-isocenter magnet (3.35 T and 9.4 T).
  • Low-temperature DNP enhancement in the upper magnet compartment.
  • High-resolution NMR spectroscopy in the lower magnet compartment.
  • Solid-state sample transfer between isocenters with minimal polarization loss.

Main Results:

  • The dual-isocenter magnet enables efficient DNP enhancement and high-resolution NMR.
  • Minimized spin polarization loss during sample transfer due to close proximity of isocenters (85 cm).
  • Demonstrated superior performance compared to strategies using separate magnets.

Conclusions:

  • The novel dual-isocenter spectrometer significantly improves hyperpolarization strategies for NMR.
  • This setup expands the applicability of DNP-enhanced NMR to a wider range of spin systems.
  • Offers a more efficient and sensitive approach for liquid-state NMR applications.