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Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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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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Radical Reactivity: Overview01:11

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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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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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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Towards Redox-Driven Unidirectional Molecular Motion.

Hella Logtenberg1, Jetsuda Areephong1, Jurica Bauer1

  • 1Stratingh Institute for Chemistry, Faculty of Mathematics and Natural Sciences, University of Groningen, Nijenborgh 4, 9747 AG, The Netherlands.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|February 9, 2016
PubMed
Summary
This summary is machine-generated.

Researchers explored redox-driven molecular motion using a rotary motor. Oxidation and reduction cycles can drive the motor, offering an alternative to light-driven mechanisms without degradation.

Keywords:
cyclic voltammetryelectrochemistryelectrochromismmolecular switchingphotochromism

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Area of Science:

  • Supramolecular Chemistry
  • Molecular Machines
  • Electrochemistry

Background:

  • Molecular motors offer precise control over motion at the nanoscale.
  • Light-driven motors are well-established, but redox-driven alternatives are sought.
  • Overcrowded alkene-based rotary motors provide a platform for studying molecular motion.

Purpose of the Study:

  • To investigate the electrochemical driving of an overcrowded alkene-based unimolecular rotary motor.
  • To determine if oxidation/reduction cycles can induce rotary motion without motor degradation.
  • To explore the mechanistic pathways of redox reactions involving the molecular motor.

Main Methods:

  • Electrochemical oxidation and reduction of the molecular motor.
  • Preparative electrolysis for isolation of reaction intermediates.
  • Single-crystal X-ray analysis for structural confirmation.
  • Kinetic studies to differentiate reaction pathways.

Main Results:

  • Two-electron oxidation leads to irreversible deprotonation and loss of stereogenic center.
  • Under specific conditions (short timescales, absence of Brønsted acids), dication formation occurs.
  • Rapid reduction of the dication reforms the original motor, potentially in different conformations.
  • The reformed motor can undergo thermal helix inversion, completing a rotary cycle.

Conclusions:

  • Redox cycling presents a viable electrochemical method for driving molecular rotary motors.
  • Controlled electrochemical conditions can enable motor operation without chemical degradation.
  • The study provides insights into the redox behavior and potential for electrochemical actuation of molecular machines.