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相关概念视频

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
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...
1.0K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

692
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...
692
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
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...
1.1K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.3K
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...
1.3K
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

5.2K
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...
5.2K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

631
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...
631

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Measuring Interactions of Globular and Filamentous Proteins by Nuclear Magnetic Resonance Spectroscopy NMR and Microscale Thermophoresis MST
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自动安装多场固态NMR光谱

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
概括
此摘要是机器生成的。

这项研究介绍了AMES-Fit,这是一个用于自动模拟和安装核磁共振 (NMR) 线形状的新工具. 它有效地找到四极核的最佳参数,节省了大量的时间和精力.

关键词:
线形适配 线形适配 线形适配核磁共振软件是一个NMR软件.这是四极核.随机搜索 随机搜索 随机搜索固态NMR是一种固态NMR.

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科学领域:

  • 固态核磁共振 (NMR) 光谱学 固态核磁共振 (NMR) 光谱学
  • 计算化学计算化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 对半整数四极核的核磁共振 (NMR) 线形状分析涉及许多适合参数.
  • 现有的自动装配程序与局部最小值和同时装配多个实验条件 (例如,多场魔法角度旋转 (MAS) 和静态光谱) 斗争.
  • 手动安装是耗时的,需要专家评估.

研究的目的:

  • 开发一种自动化工具,用于对复杂的NMR线形进行准确和高效的模拟参数匹配.
  • 克服现有的自动化方法在处理多个实验数据集和参数空间方面的局限性.
  • 为了减少NMR光谱分析所需的计算时间和人力资源.

主要方法:

  • 介绍了AMES-Fit (自动多重实验模拟和装配) 软件.
  • 实现一个适应性步骤大小随机搜索算法,用于参数空间探索.
  • 同时安装多场MAS和静态NMR光谱.

主要成果:

  • AMES-Fit成功地自动化了对多场NMR线形的全球最佳匹配模拟参数确定.
  • 该软件需要最小的人力投入,并有效地导航复杂的参数景观.
  • 在几分钟内达到最佳适应,与手工方法 (几个人小时) 相比,大大减少了时间.

结论:

  • AMES-Fit提供了一种高效和自动化的解决方案,用于分析半整数四极核的NMR线形.
  • 开源工具显著加快了光谱参数确定过程.
  • 便于在固态NMR光谱学中更容易获得和快速分析.