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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.2K
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...
1.2K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.0K
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...
2.0K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

1.6K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.6K
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

3.0K
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...
3.0K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

2.9K
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...
2.9K
Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

6.5K
Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
6.5K

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Solid state NMR service across the world.

Nathan S Barrow1, Paul Jonsen2

  • 1Johnson Matthey Technology Centre, Blount's Court Road, Sonning Common, Reading, RG4 9NH, United Kingdom.

Solid State Nuclear Magnetic Resonance
|November 18, 2019
PubMed
Summary
This summary is machine-generated.

This survey benchmarks global industrial solid-state NMR (SSNMR) facilities. The primary barrier to accessing SSNMR is a lack of awareness regarding its capabilities in materials science.

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Area of Science:

  • Materials Science
  • Analytical Chemistry

Background:

  • A previous UK-focused report in 2013 detailed NMR equipment but excluded industrial and international facilities.
  • This study addresses the need for a global benchmark of industrial solid-state NMR (SSNMR) capabilities.

Discussion:

  • Aggregated statistics on SSNMR service throughput, equipment, and staffing were collected.
  • Barriers to accessing SSNMR services were identified and discussed.
  • Findings indicate that the hardware profile in the UK is representative of the global landscape.

Key Insights:

  • The primary obstacle hindering SSNMR utilization is a lack of knowledge about its applications and potential.
  • Industrial SSNMR laboratories exhibit a consistent hardware profile internationally.
  • The survey provides a benchmark for evaluating and improving SSNMR facility performance.

Outlook:

  • This benchmark aims to help SSNMR laboratories identify and overcome access barriers.
  • Improved understanding of SSNMR capabilities can enhance its application in materials science problem-solving.
  • Further dissemination of SSNMR applications is crucial for broader adoption in industry and research.