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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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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Double Resonance Techniques: Overview01:12

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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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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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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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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...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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839
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Double-rotation (DOR) NMR spectroscopy: Progress and perspectives.

David L Bryce1

  • 1Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, and Nexus for Quantum Technologies, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario, K1N 6N5, Canada.

Solid State Nuclear Magnetic Resonance
|March 12, 2024
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Summary

Double-rotation (DOR) solid-state NMR spectroscopy, a high-resolution technique, has endured despite challenges. Advances in NMR instrumentation may lead to a revival of DOR NMR applications in chemistry and materials science.

Keywords:
Double-rotation NMRHigh resolutionQuadrupolar nucleiRotorSolid-state NMR

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Area of Science:

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

Background:

  • Double-rotation (DOR) solid-state NMR is a high-resolution technique developed in the late 1980s.
  • Multiple-quantum magic-angle spinning (MQMAS) became the dominant high-resolution method for half-integer spin quadrupoles after 1995.
  • DOR NMR has continued to be developed and applied to chemical and materials science problems.

Purpose of the Study:

  • To review the historical development of DOR NMR spectroscopy.
  • To discuss the diverse applications of DOR NMR in various scientific fields.
  • To explore potential future directions and advancements for DOR NMR.

Main Methods:

  • Review of historical development and applications of DOR NMR.
  • Analysis of technical limitations inherent to the DOR NMR rotor system.
  • Discussion of emerging NMR instrumentation and their potential impact.

Main Results:

  • DOR NMR has faced technical limitations primarily due to the size of its double rotor system.
  • These limitations include low rotor spinning frequencies, poor filling factors, and limited radiofrequency power.
  • Despite these challenges, DOR NMR has maintained relevance and application.

Conclusions:

  • Ongoing advancements in NMR instrumentation, such as smaller MAS rotors and spherical rotors, could overcome current DOR NMR limitations.
  • These technological improvements may herald a resurgence, or renaissance, for DOR NMR applications.
  • DOR NMR remains a valuable technique with potential for future innovation in chemical and materials science research.