Related Experiment Video
Updated: Jun 28, 2026
09:49
A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
Charge transfer reactions along a supramolecular redox gradient
Aurelio Mateo-Alonso1, Christian Ehli, Dirk M Guldi
1Center of Excellence for Nanostructured Materials, Italian Interuniversity Consortium on Materials Science and Technology, Dipartimento di Scienze Farmaceutiche, Università degli Studi di Trieste, Italy. amateo@units.it
Journal of the American Chemical Society
|October 22, 2008
Summary
This study demonstrates a rotaxane scaffold that aligns photo/electroactive units. This alignment enables a cascade of through-space charge transfer reactions along a supramolecular redox gradient.
Area of Science:
- Supramolecular Chemistry
- Photochemistry
- Electrochemistry
Background:
- Rotaxanes are mechanically interlocked molecules with potential in molecular machines.
- Controlling the spatial arrangement of photo/electroactive units is crucial for efficient charge transfer.
Purpose of the Study:
- To utilize a rotaxane scaffold for precise alignment of photo/electroactive components.
- To investigate cascade charge transfer reactions driven by a supramolecular redox gradient.
Main Methods:
- Synthesis of a custom rotaxane incorporating three photo/electroactive units.
- Characterization of the supramolecular redox gradient along the rotaxane.
- Spectroscopic and electrochemical methods to study charge transfer dynamics.
Main Results:
- Successful alignment of photo/electroactive units on the rotaxane scaffold.
- Observation of a cascade of through-space charge transfer reactions.
- Evidence for efficient energy/electron transfer along the redox gradient.
Conclusions:
- Rotaxane scaffolds can effectively control the spatial arrangement of functional units.
- Supramolecular redox gradients facilitate efficient cascade charge transfer.
- This work opens avenues for designing advanced molecular electronic devices.
Related Concept Videos
01:27Redox 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...
01:24Redox 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...
01:23Redox Equilibria: Overview
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...
01:30Ladder Diagrams: Redox Equilibria
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
03:11Oxidation-Reduction Reactions
Oxidation–Reduction Reactions
01:19Oxidation 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.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...