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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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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NMR Spectrometers: Resolution and Error Correction01:14

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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 Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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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.
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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Improving the Mass-Limited Performance of Routine NMR Probes using Coupled Coils.

Brian Marsden1, Victor Lim2, Bob Taber2

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Journal of Magnetic Resonance (San Diego, Calif. : 1997)
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Summary
This summary is machine-generated.

A new method transforms standard dual-broadband nuclear magnetic resonance (NMR) probes into high-performance, mass-limited probes for various nuclei. This cost-effective magnetic coupling technique enhances NMR probe performance without requiring new equipment or larger spectrometer footprints.

Keywords:
Coupled coilsMagnetic couplingMass limited

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Analytical Chemistry
  • Spectroscopic Instrumentation

Background:

  • Routine nuclear magnetic resonance (NMR) probes often have limitations in performance for specific applications.
  • Enhancing probe performance typically requires expensive hardware upgrades or complete probe replacement.
  • Mass-limited probes are crucial for analyzing small sample quantities in NMR.

Purpose of the Study:

  • To introduce a novel method for converting general-use dual-broadband NMR probes into high-performance, mass-limited probes.
  • To enable on-demand switching between probe functionalities for increased experimental flexibility.
  • To provide a cost-effective solution for improving NMR spectroscopy capabilities.

Main Methods:

  • The study utilizes magnetic coupling of inductors to modify existing NMR probes.
  • This technique allows for the on-demand conversion of a dual-broadband probe.
  • The method targets both high-band and low-band nuclei, enhancing versatility.

Main Results:

  • Successfully demonstrated the conversion of a standard NMR probe to a high-performance, mass-limited configuration.
  • The magnetic coupling method proved effective for both high and low band nuclei.
  • The enhanced probe maintained high performance without altering the spectrometer's physical footprint.

Conclusions:

  • The developed method offers a significant advancement in NMR probe technology.
  • This approach provides a cost-effective way to upgrade routine NMR probes.
  • The on-demand conversion capability enhances the utility and performance of existing NMR instrumentation.