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Related Concept Videos

Redox Reactions01:24

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...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Types of Chemical Reactions: Exchange and Reversible01:08

Types of Chemical Reactions: Exchange and Reversible

An exchange reaction is a chemical reaction in which both synthesis and decomposition occur, chemical bonds are both formed and broken, and chemical energy is absorbed, stored, and released.
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Redox Reactions01:27

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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Related Experiment Video

Updated: Jun 29, 2026

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance
10:51

Fabrication and Validation of an Organ-on-chip System with Integrated Electrodes to Directly Quantify Transendothelial Electrical Resistance

Published on: September 26, 2017

Exciplexes and electron transfer reactions.

S L Mattes, S Farid

    Science (New York, N.Y.)
    |November 23, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Electronically excited molecules form charge-transfer complexes called exciplexes, crucial for probing materials and enabling photoreactions. These processes, including electron transfer, are vital in organic photochemistry and have diverse applications.

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    Area of Science:

    • Photochemistry
    • Physical Chemistry
    • Materials Science

    Background:

    • Electronically excited molecules act as potent electron donors/acceptors.
    • Charge-transfer complexes (exciplexes) form from excited molecules, yielding radical ions.

    Purpose of the Study:

    • To explore the significance of exciplexes and photochemical electron transfer in organic chemistry.
    • To highlight their roles in probing materials and driving photoreactions.

    Main Methods:

    • Exciplex emission spectroscopy for analyzing polymers, membranes, and micelles.
    • Investigation of photochemical electron transfer processes.

    Main Results:

    • Exciplex emission is a key technique for material characterization.
    • Photochemical electron transfer underpins photography and electrophotography.
    • New electron-transfer photooxygenations show significant diversity.

    Conclusions:

    • Exciplexes and photochemical electron transfer are fundamental to organic photochemistry.
    • These phenomena offer versatile applications in synthesis and analysis.