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Related Concept Videos

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

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

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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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¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

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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...
5.1K
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
791
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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

1.3K
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...
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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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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

665
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.
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Related Experiment Video

Updated: Jun 25, 2025

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Frequency multiplexing enables parallel multi-sample EPR.

Chun Him Lee1, Jan G Korvink2, Mazin Jouda3

  • 1Karlsruhe Institute of Technology, Institute of Microstructure Technology, 76344, Eggenstein-Leopoldshafen, Germany.

Scientific Reports
|May 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for parallel Electron Paramagnetic Resonance (EPR) spectroscopy, enabling simultaneous analysis of multiple samples. This breakthrough significantly enhances throughput for EPR analysis in various scientific fields.

Keywords:
High-throughputParallel EPRParallel ODNP

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Last Updated: Jun 25, 2025

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Electron Paramagnetic Resonance (EPR) spectroscopy is vital for studying unpaired electrons in diverse fields.
  • Current EPR systems are limited by low sample throughput, analyzing only one sample at a time.

Purpose of the Study:

  • To develop a novel scheme for ultra-high frequency continuous-wave EPR (CW EPR) enabling parallel analysis of multiple samples.
  • To overcome the throughput limitations of conventional EPR systems.

Main Methods:

  • Designed a prototype with two decoupled detection cells using high-quality factor solenoidal coils at 488 and 589 MHz.
  • Employed orthogonal coil alignment and an innovative radiofrequency circuit for enhanced decoupling.
  • Demonstrated parallel EPR on up to eight sample cells using a single RF channel.

Main Results:

  • Achieved high signal-to-noise ratios (255 and 252) for two parallel BDPA samples (18.3 μL each) with no observable coupling.
  • The prototype utilizes cost-effective, commercially available fabrication technology.
  • Demonstrated scalability and potential for high-throughput screening.

Conclusions:

  • The developed parallel EPR system significantly improves sample throughput.
  • This cost-effective and scalable technology offers a promising advancement for rapid sample screening in EPR spectroscopy.