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Redox Reactions

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...

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Related Experiment Video

Updated: Jul 11, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Multi-step redox systems with NIR-fluorescence based on 4H-imidazoles.

Martin Matschke¹, Rainer Beckert

¹Institute of Organic and Makromolecular Chemistry, Friedrich-Schiller University D-07743 Jena, Humboldtstr. 10, Germany.

Molecules (Basel, Switzerland)

|September 14, 2007

Summary

Researchers synthesized novel 4H-imidazoles and boratetraazapentalenes. These compounds exhibit significant spectral shifts and NIR-fluorescence, with stable radical anions indicating potential in redox systems.

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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

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Last Updated: Jul 11, 2026

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

Published on: November 2, 2009

Area of Science:

Organic Chemistry
Materials Science
Photochemistry

Background:

Fused-ring aromatic dinitriles serve as precursors for novel heterocyclic compounds.
Merocyanine and cyanine dyes are known for their unique photophysical properties.
Mesoionic compounds offer intriguing electronic and redox characteristics.

Purpose of the Study:

To synthesize a new class of 4H-imidazoles from fused-ring aromatic dinitriles.
To explore the photophysical properties, specifically UV/vis spectral shifts, of these synthesized compounds.
To synthesize novel boratetraazapentalenes and investigate their fluorescence and redox behavior.

Main Methods:

Synthesis of 4H-imidazoles via reactions with fused-ring aromatic dinitriles.
UV/vis spectroscopy to observe spectral shifts upon protonation/deprotonation.
Cyclization reactions with boron trifluoride to form boratetraazapentalenes.
Electrochemical methods and computational calculations to study redox properties and radical anion stability.

Main Results:

Successful synthesis of a new class of 4H-imidazoles.
Observed strong bathochromic shifts in UV/vis spectra due to merocyanine-to-cyanine conversion.
Synthesized novel boratetraazapentalenes exhibiting NIR-fluorescence.
Demonstrated participation in quasi-reversible multi-step redox systems with high thermodynamic stability for radical anions (K(SEM) = 3x10(10) to 5x10(11)).

Conclusions:

The synthesized 4H-imidazoles and boratetraazapentalenes possess tunable photophysical properties.
The mesoionic boratetraazapentalenes are promising candidates for applications requiring NIR-fluorescence and stable redox-active species.
The study highlights the potential of these novel heterocyclic compounds in materials science and electrochemistry.