Publication

Photoinduced oxidation of N-vinylcarbazole in a functionalized oil-in-water microemulsion

Michael Graetzel, Carole Graetzel
1985
Journal Articles

Abstract

The photoprocesses of N-vinylcarbazole (NVC) solubilized in the interior of an oil-in-water microemulsion (CTA-ci, hexadecyltrimethylammonium counter ion) functionalized by an oxidizing agent, S2O2−8, were studied using ruby laser and spectrofluorimeter techniques. It was found that the excited singlet state of NVC reacts quickly with the persulfate to form its radical cation, exhibiting absorption maxima at 790, 700, 630 and 500 nm. Upon increasing the concentration of NVC substrate, a shift is observed in the absorption maximum of the cation at 790—770 nm, indicative of the formation of a dimer cation, (NVC)+2. This formation is further upheld by the augmentation of the decay rate of the cation with increasing substrate concentration.

Official source

https://infoscience.epfl.ch/entities/publication/1127052a-8dc5-4ef3-b36f-8cb1c5ab9a48

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Michael Graetzel, Carole Graetzel
1985
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1127052a-8dc5-4ef3-b36f-8cb1c5ab9a48

About this result

Related concepts (31)

Radioactive decay

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha, beta, and gamma decay, all of which involve emitting particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force.

Oxidizing agent

An oxidizing agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) is a substance in a redox chemical reaction that gains or "accepts"/"receives" an electron from a (called the , , or ). In other words, an oxidizer is any substance that oxidizes another substance. The oxidation state, which describes the degree of loss of electrons, of the oxidizer decreases while that of the reductant increases; this is expressed by saying that oxidizers "undergo reduction" and "are reduced" while reducers "undergo oxidation" and "are oxidized".

Reducing agent

In chemistry, a reducing agent (also known as a reductant, reducer, or electron donor) is a chemical species that "donates" an electron to an (called the , , , or ). Examples of substances that are common reducing agents include the alkali metals, formic acid, oxalic acid, and sulfite compounds. In their pre-reaction states, reducers have extra electrons (that is, they are by themselves reduced) and oxidizers lack electrons (that is, they are by themselves oxidized). This is commonly expressed in terms of their oxidation states.

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Photoinduced oxidation of N-vinylcarbazole in a functionalized oil-in-water microemulsion

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