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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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

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

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...
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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

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 others.
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Dipolar double-quantum filtered rotational-echo double resonance.

Shigeru Matsuoka1, Jacob Schaefer

  • 1Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA.

Magnetic Resonance in Chemistry : MRC
|December 25, 2007
PubMed
Summary
This summary is machine-generated.

A new dipolar double-quantum filter (D-DQF) effectively removes unwanted carbon-13 background signals in rotational-echo double-resonance (REDOR) experiments, improving data quality for isotopic labeling studies.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Chemical Physics
  • Materials Science

Background:

  • Natural-abundance carbon-13 (13C) signals can obscure data in 13C[(2)H] rotational-echo double-resonance (REDOR) experiments.
  • Isotopic labeling is crucial for structural and dynamic studies but requires effective background suppression.

Purpose of the Study:

  • To develop and validate a novel dipolar double-quantum filter (D-DQF) for suppressing natural-abundance 13C signals.
  • To enhance the sensitivity and reliability of 13C[(2)H] REDOR experiments.

Main Methods:

  • Utilizing homonuclear dipolar coupling of directly bonded 13C-13C pairs to create the D-DQF.
  • Implementing the D-DQF excitation and reconversion prior to the REDOR evolution period for optimal efficiency.
  • Performing 13C[(2)H] D-DQF-REDOR experiments on a test sample of mixed recrystallized labeled alanines.

Main Results:

  • The D-DQF effectively removed the natural-abundance 13C background.
  • Calculated and experimentally observed 13C[(2)H] D-DQF-REDOR dephasings showed excellent agreement.
  • The optimized experimental setup demonstrated high efficiency.

Conclusions:

  • The developed D-DQF is a powerful tool for background suppression in 13C[(2)H] REDOR NMR.
  • This method significantly improves the quality of data obtained from isotopically labeled samples.
  • The findings facilitate more accurate structural and dynamic analyses using solid-state NMR.