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相关概念视频

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

198
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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

666
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
666
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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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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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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超极化小分子使用准和固态旋转扩散.

Martin Gierse1, Laurynas Dagys1, Michael Keim1

  • 1NVision Imaging Technologies GmbH, 89081, Ulm, Germany.

Angewandte Chemie (International ed. in English)
|May 28, 2024
PubMed
概括
此摘要是机器生成的。

一种名为PHIP-SSD的新方法增强了分子的超极化,使用了对诱导极化 (PHIP) 和固态自旋扩散. 这种技术扩大了PHIP的适用性,用于创建各种应用的超极化化合物.

关键词:
这是NMR的NMR.过极化的超极化准气为一种气.旋转扩散扩散的作用

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科学领域:

  • 磁共振光谱学 磁共振光谱学
  • 超极化技术 超极化技术
  • 固态化学 固态化学

背景情况:

  • 过诱导极化 (PHIP) 提供了廉价的超极化,但由于它依赖于与H2的特定化学反应而受到限制.
  • 现有的PHIP方法需要与气直接相互作用,这限制了它们的普遍适用性.

研究的目的:

  • 开发一种新的方法,PHIP-SSD,以扩大PHIP超极化的范围.
  • 为了使在初始PHIP反应中没有直接参与的目标分子的超极化.

主要方法:

  • 使用PHIP生成一个超极化源分子 ([1-13C]-酸盐).
  • 采用固态自旋扩散来将两极化从源向目标分子转移.
  • 溶解极化点分子用于溶液状态的NMR应用.

主要成果:

  • 从[1-13C]-fumarate向各种13C标记的标分子成功地证明了极化转移.
  • 对于[1-13C]-酸,13C两极分化达到0.01%至3%.
  • 通过简单的粉末研磨,获得了对[13C,15N2]-urea,[1-13C]-pyruvate和[1-13C]-benzoic acid的100-200倍信号增强.

结论:

  • 通过固态旋转扩散,PHIP-SSD有效地转移超极化,扩大了PHIP的实用性.
  • 该方法不需要特定的联合结晶,允许各种分子的轻松超极化.
  • 基于PHIP的PHIP-SSD提出了一个基于PHIP的可访问超极化有前途的战略.