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Radical Reactivity: Overview

Radical Reactivity: Overview

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 molecule. These three...

Radical Reactivity: Steric Effects

Radical Reactivity: Steric Effects

The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
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Radical Formation: Overview

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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 latter, also known...

Radical Formation: Addition

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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.
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Radical Chain-Growth Polymerization: Overview

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Radical Reactivity: Nucleophilic Radicals

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

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Spintronic Transport through Polyphenoxyl Radical Molecules.

Katsunori Tagami¹, Masaru Tsukada

¹Department of Physics, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

The Journal of Physical Chemistry. B

|October 28, 2008

Summary

This study explores quantum transport in spin-polarized molecules, finding they can act as spin filters or valves. Molecular conductance changes can also detect chemical adsorption.

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Area of Science:

Quantum physics
Molecular electronics
Materials science

Background:

Spin-polarized molecules offer unique electronic properties.
Controlling electron spin is crucial for spintronic devices.
Polyphenoxyl radicals are promising molecular candidates.

Purpose of the Study:

Investigate coherent quantum transport properties in spin-polarized polyphenoxyl radical molecules.
Determine the potential of these molecules as spin filters or spin valves.
Explore the molecule's response to chemical adsorption.

Main Methods:

Density-functional-derived tight-binding model.
Green's functions method for quantum transport calculations.
Analysis of transmission spectra and spin-dependent currents.

Main Results:

Majority and minority spin components show distinct transmission spectra near the Fermi level.
Different spin currents generated under bias voltage.
Molecular bridge functions as a spin filter/valve when magnetization is fixed.
Total spin current exceeds that of the reduced form at low bias.
Conductance changes indicate chemical species adsorption on radical sites.

Conclusions:

Spin-polarized polyphenoxyl radicals exhibit potential for spintronic applications like spin filters and valves.
The molecule's conductance is sensitive to chemical adsorption, enabling sensing capabilities.
Quantum transport phenomena in these molecules are crucial for device design.