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Related Concept Videos

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Atomic Nuclei: Types of Nuclear Relaxation01:28

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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Radical Formation: Overview01:03

Radical Formation: Overview

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

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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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Updated: Jul 30, 2025

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Modeling spin relaxation in complex radical systems using MolSpin.

Luca Gerhards1, Claus Nielsen2, Daniel R Kattnig3

  • 1Institute of Physics, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.

Journal of Computational Chemistry
|May 15, 2023
PubMed
Summary
This summary is machine-generated.

Modeling spin relaxation in free radicals is complex. We present an efficient implementation of Bloch-Redfield-Wangsness theory in the MolSpin toolkit for easier study of radical reactions.

Keywords:
Bloch-Redfield-Wangsnessradical pairsspin dynamicsspin relaxation

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Area of Science:

  • Physical Chemistry
  • Quantum Dynamics
  • Biophysics

Background:

  • Spin relaxation critically influences the spin dynamics of free radicals.
  • Understanding spin relaxation is vital for applications like quantum computing and understanding biological magnetic sense.

Purpose of the Study:

  • To develop a generalized and efficient implementation of Bloch-Redfield-Wangsness (BRW) theory.
  • To provide an accessible tool for studying spin relaxation in complex radical systems.

Main Methods:

  • Utilized Bloch-Redfield-Wangsness (BRW) theory to derive a quantum mechanical master equation.
  • Developed a new feature for the MolSpin toolkit for generalized implementation of BRW theory.

Main Results:

  • Introduced an efficient and generalized implementation of BRW theory.
  • The MolSpin toolkit now offers an easy-to-use approach for studying reacting radicals.

Conclusions:

  • The new MolSpin feature simplifies the complex process of modeling spin relaxation.
  • Facilitates research in areas from quantum information to avian magnetoreception.