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Related Concept Videos

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...
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
08:40

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

High-resolution NMR spectroscopy with a portable single-sided sensor.

Juan Perlo1, Vasiliki Demas, Federico Casanova

  • 1Institut für Technische Chemie und Makromolekulare Chemie, RWTH-Aachen, D-52056, Germany.

Science (New York, N.Y.)
|April 9, 2005
PubMed
Summary

A new portable nuclear magnetic resonance sensor was developed. This sensor achieves high-resolution fluorine-19 spectra, overcoming previous limitations in open probe instruments for chemical shift analysis.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Portable nuclear magnetic resonance (NMR) sensors offer significant advantages for on-site chemical analysis.
  • However, open probe designs have historically struggled with magnetic field inhomogeneity, limiting spectral resolution and chemical shift information.
  • Previous instruments lacked the precision required for detailed molecular characterization.

Purpose of the Study:

  • To report the construction of a novel portable NMR sensor.
  • To address the challenge of magnetic field inhomogeneity in single-sided open probe designs.
  • To enable high-resolution fluorine-19 (¹⁹F) NMR spectroscopy with chemical shift information.

Main Methods:

  • Development of a portable NMR sensor featuring a single-sided open probe.
  • Implementation of a specialized pulse sequence to compensate for magnetic field inhomogeneity.
  • Utilizing parallel inhomogeneity in the applied radio frequency field for compensation.

Main Results:

  • Successful construction and operation of the portable NMR sensor.
  • Acquisition of fluorine-19 spectra from liquid fluorocarbons.
  • Achieved a spectral resolution of 8 parts per million (ppm).
  • Demonstrated the ability to obtain chemical shift information, a significant advancement for open probe instruments.

Conclusions:

  • The developed portable NMR sensor effectively overcomes magnetic field inhomogeneity.
  • High-resolution ¹⁹F NMR spectroscopy with chemical shift information is achievable with open probe designs.
  • This technology paves the way for advanced portable analytical applications.