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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Chemical Shift: Internal References and Solvent Effects01:17

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

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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.
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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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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Double Resonance Techniques: Overview01:12

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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...
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Applications of Fast Iterative Filtering in NMR Spectroscopy: Baseline Correction.

Letizia Fiorucci1,2,3, Francesco Bruno1,2,3, Marco Ricci4

  • 1Department of Chemistry "Ugo Schiff", Università degli Studi di Firenze, Firenze, Italy.

Magnetic Resonance in Chemistry : MRC
|July 7, 2025
PubMed
Summary
This summary is machine-generated.

Fast iterative filtering (FIF) effectively separates baseline from peaks in NMR data. This technique is valuable for analyzing spectra from paramagnetic compounds, even with distortions.

Keywords:
baseline distortionbroadband excitationpNMR

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Signal Processing

Background:

  • Non-stationary signals require advanced analysis techniques.
  • Empirical Mode Decomposition (EMD) is a related method for signal analysis.
  • Nuclear Magnetic Resonance (NMR) spectroscopy generates complex signals.

Purpose of the Study:

  • To demonstrate the efficacy of Fast Iterative Filtering (FIF) in NMR data processing.
  • To highlight FIF's ability to separate spectral components.
  • To showcase FIF's utility for analyzing spectra of paramagnetic compounds.

Main Methods:

  • Application of Fast Iterative Filtering (FIF) to NMR signals.
  • Decomposition of signals into intrinsic mode functions.
  • Evaluation of FIF's performance on distorted spectra.

Main Results:

  • FIF successfully partitions broad and narrow spectral features.
  • FIF effectively separates baseline components from peaks.
  • FIF demonstrates robustness in processing heavily distorted NMR spectra.

Conclusions:

  • Fast Iterative Filtering (FIF) is a powerful tool for NMR spectral analysis.
  • FIF's baseline separation capability is crucial for processing paramagnetic compound spectra.
  • FIF offers an advantage in handling complex and distorted spectral data.