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Related Concept Videos

Electron Carriers01:24

Electron Carriers

Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
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Oxidation and Reduction of Organic Molecules

Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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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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Oxygen carriers based on electrochemically reduced trinitroarenes.

Iluminada Gallardo1, Gonzalo Guirado

  • 1Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. Iluminada.Gallardo@uab.es

Physical Chemistry Chemical Physics : PCCP
|July 26, 2008
PubMed
Summary
This summary is machine-generated.

Nitroaromatic compounds like 1,3,5-trinitrobenzene undergo reversible dimerization after electrochemical reduction. The resulting dimer captures molecular oxygen, forming an adduct capable of reversible oxygen binding and removal.

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Area of Science:

  • Electrochemistry
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Nitroaromatic compounds are known for their energetic properties and diverse chemical reactivity.
  • Electrochemical reduction is a powerful tool for generating reactive intermediates like anion radicals.
  • Dimerization of radical species can lead to novel supramolecular structures with unique functionalities.

Purpose of the Study:

  • To investigate the electrochemical behavior of specific nitroaromatic compounds: 1,3,5-trinitrobenzene, 2,4,6-trinitrotoluene, and 1-methoxy-2,4,6-trinitrobenzene.
  • To explore the formation and properties of pi-dimers generated from electrochemically reduced nitroaromatics.
  • To determine the capability of these pi-dimers to interact with molecular oxygen and form adducts.

Main Methods:

  • Electrochemical reduction of nitroaromatic compounds.
  • Spectroscopic analysis to characterize the formed pi-dimers.
  • Investigation of the reaction between pi-dimers and molecular oxygen (O(2)).
  • Redox stimulus application to assess reversible oxygen binding.

Main Results:

  • 1,3,5-Trinitrobenzene, 2,4,6-trinitrotoluene, and 1-methoxy-2,4,6-trinitrobenzene undergo reversible dimerization upon electrochemical reduction of their anion radicals.
  • The generated pi-dimers effectively capture molecular oxygen (O(2)) in oxygen-rich atmospheres, forming sigma(o-o)(H)-adducts.
  • These sigma(o-o)(H)-adducts demonstrate the ability to reversibly bind and release dioxygen when subjected to an external redox stimulus.

Conclusions:

  • Electrochemical reduction of nitroaromatics provides a pathway to generate reactive pi-dimers.
  • These pi-dimers exhibit a unique ability to capture and reversibly bind molecular oxygen.
  • The developed system holds potential for applications in oxygen sensing or removal technologies.