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相关概念视频

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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

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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...
1.4K
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
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.3K
¹H NMR Signal Integration: Overview00:58

¹H NMR Signal Integration: Overview

1.5K
The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
1.5K
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

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15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the &#181;s-ms Timescale
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红色:基于分解的交互式多配件NMR峰值采集助手.

Mehdi Rahimi1, Abigail Chiu1, Andrea Estefania Lopez Giraldo1

  • 1Department of Chemistry, University of Colorado Denver, Denver, CO 80204, USA.

Journal of magnetic resonance (San Diego, Calif. : 1997)
|December 1, 2023
PubMed
概括
此摘要是机器生成的。

我们介绍了REDEN (NMR峰值的残留分解),这是一个新的开源软件,用于识别NMR频谱中的峰值. 该工具通过交互式峰值分解和多个配件选项来增强光谱分析.

关键词:
图形用户界面 图形用户界面多个配件的多个配件这就是POKY.峰值分解的分解情况已经被救赎了

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科学领域:

  • 分析化学 分析化学
  • 频谱学是一种光谱学.
  • 计算化学计算化学

背景情况:

  • 核磁共振 (NMR) 光谱对于分子结构的确定至关重要.
  • 在NMR光谱中准确识别峰值对于可靠的数据分析至关重要.
  • 现有的高峰采摘方法可能是劳动密集型的,需要人工干预.

研究的目的:

  • 开发和介绍一个新的软件工具REDEN (NMR峰值的残留分解),用于NMR频谱中的自动和交互式峰值识别.
  • 为光谱数据处理提供高效和用户友好的解决方案.
  • 为了提高NMR光谱分析的准确性和速度.

主要方法:

  • 在频率领域,REDEN采用了峰值分解方法.
  • 该软件与POKY套件集成,提供交互式工作流 (iPick).
  • 模拟峰值的多重装配使用四种线形选项进行:高斯式,洛伦斯式,快速/优化洛伦斯式和伪Voigt.

主要成果:

  • REDEN通过NMR信号的视觉分解来促进显式峰值采集.
  • 该软件提供两个操作模式 (基本和高级) 用于用户定义的微调.
  • 与POKY套件的集成确保了无和高效的用户体验.

结论:

  • 雷登提供了一个强大的开源解决方案,用于NMR光谱峰值识别.
  • 该软件的交互性和先进的安装选项提高了NMR数据分析的效率和准确性.
  • 作为POKY套件的一部分,REDEN可以轻松获得,为研究人员促进可访问性.