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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
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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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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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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

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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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Automatic fitting of multiple-field solid-state NMR spectra.

Frédéric A Perras1, Alexander L Paterson2

  • 1Chemical and Biological Sciences Division, Ames National Laboratory, Ames, IA, 50011, United States; Department of Chemistry, Iowa State University, Ames, IA, 50011, United States.

Solid State Nuclear Magnetic Resonance
|April 11, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces AMES-Fit, a new tool for automatic simulation and fitting of nuclear magnetic resonance (NMR) lineshapes. It efficiently finds optimal parameters for quadrupolar nuclei, saving significant time and effort.

Keywords:
Lineshape fittingNMR softwareQuadrupolar nucleiRandom searchSolid-state NMR

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Computational Chemistry
  • Materials Science

Background:

  • Nuclear magnetic resonance (NMR) lineshape analysis for half-integer quadrupolar nuclei involves numerous fit parameters.
  • Existing automatic fitting routines struggle with local minima and simultaneous fitting of multiple experimental conditions (e.g., multiple-field magic-angle spinning (MAS) and static spectra).
  • Manual fitting is time-consuming and requires expert evaluation.

Purpose of the Study:

  • To develop an automated tool for accurate and efficient simulation parameter fitting for complex NMR lineshapes.
  • To overcome the limitations of existing automated methods in handling multiple experimental datasets and parameter spaces.
  • To reduce the computational time and human effort required for NMR spectral analysis.

Main Methods:

  • Introduction of AMES-Fit (Automatic Multiple Experiment Simulation and Fitting) software.
  • Implementation of an adaptive step size random search algorithm for parameter space exploration.
  • Simultaneous fitting of multiple-field MAS and static NMR spectra.

Main Results:

  • AMES-Fit successfully automates the global best-fit simulation parameter determination for multiple-field NMR lineshapes.
  • The software requires minimal human input and effectively navigates complex parameter landscapes.
  • Achieves optimal fits within minutes, drastically reducing the time compared to manual methods (several person-hours).

Conclusions:

  • AMES-Fit provides an efficient and automated solution for analyzing NMR lineshapes of half-integer quadrupolar nuclei.
  • The open-source tool significantly accelerates the process of spectral parameter determination.
  • Facilitates more accessible and rapid analysis in solid-state NMR spectroscopy.