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Related Concept Videos

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

5.4K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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Radical Formation: Addition00:47

Radical Formation: Addition

2.4K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
2.4K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

3.8K
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...
3.8K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

3.0K
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...
3.0K
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

4.5K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
4.5K
Radical Formation: Overview01:03

Radical Formation: Overview

2.7K
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...
2.7K

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Related Experiment Video

Updated: Apr 7, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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11.9K

Electronic structure and spin delocalization in Blatter radical derivatives: A computational study.

Ying Gao1, Yong Wu2, Bo Ren1

  • 1Jilin Provincial Key Laboratory of Straw-Based Functional Materials, Institute for Interdisciplinary Biomass Functional Materials Studies, Jilin Engineering Normal University, Changchun, 130052, PR China.

Journal of Molecular Graphics & Modelling
|April 5, 2026
PubMed
Summary

Blatter radicals exhibit remarkable stability due to delocalized unpaired electrons. Structural modifications minimally impact their electronic framework, with limited radiative decay from excited states.

Keywords:
Blatter radical derivativesFluorescence radiative rateNatural transition orbital

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Related Experiment Videos

Last Updated: Apr 7, 2026

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

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Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Photophysics

Background:

  • Blatter radicals are recognized for their exceptional thermodynamic stability.
  • Understanding structure-property relationships is crucial for designing novel radical systems.

Purpose of the Study:

  • To investigate the influence of structural modifications on the electronic structure and excited-state properties of Blatter radicals and their derivatives.
  • To explore the factors governing the photophysical behavior, including absorption and emission characteristics.

Main Methods:

  • Systematic density functional theory (DFT) calculations were employed.
  • Spin-density analysis was performed to assess electron delocalization.
  • Time-dependent DFT (TD-DFT) calculations were used to study excited-state properties.
  • Natural transition orbital (NTO) analysis elucidated the nature of electronic transitions.

Main Results:

  • Spin-density analysis confirmed the delocalization of the unpaired electron across the radical framework, reinforcing inherent stability.
  • TD-DFT calculations revealed that dominant absorptions arise from higher excited states.
  • The lowest doublet excited state (D1) exhibits weak oscillator strength, limiting radiative decay (rate constants 10^6-10^7 s^-1).
  • NTO analyses showed substituent-dependent character of the D1 states (α-type for 2-X/3-X, mixed α/β for 7-X).

Conclusions:

  • Structural modifications do not fundamentally alter the open-shell electronic framework of Blatter radicals.
  • The limited radiative decay from the D1 state is a key characteristic, influenced by small structural differences between ground and excited states.
  • Substituent effects play a role in the nature of electronic transitions but do not override the intrinsic properties of the Blatter radical system.