At the crossroad of photochemistry and radiation chemistry: formation of hydroxyl radicals in diluted aqueous solutions exposed to ultraviolet radiation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00508701" target="_blank" >RIV/61389021:_____/17:00508701 - isvavai.cz</a>

Alternative codes found

RIV/68378271:_____/17:00484754 RIV/68407700:21340/17:00317958

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2017/CP/C7CP05125E#!divAbstract" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2017/CP/C7CP05125E#!divAbstract</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c7cp05125e" target="_blank" >10.1039/c7cp05125e</a>

Result language

angličtina

Original language name

At the crossroad of photochemistry and radiation chemistry: formation of hydroxyl radicals in diluted aqueous solutions exposed to ultraviolet radiation

Original language description

Formation yields of center dot OH radicals were precisely determined in aqueous solutions of coumarin-3-carboxylic acid and ferrous sulfate (i.e., Fricke dosimeter) exposed to 253.7 nm radiation delivered from a continuous source. Quantum yield of center dot OH radicals was determined as similar to 0.08, i.e., roughly one out of twelve photons, efficiently absorbed in UV-illuminated solutions, produced one center dot OH radical. Energetically, a water molecule should undergo a correlated action of at least two 4.9 eV photons delivering enough energy for direct H-OH dissociation (5.0-5.4 eV). We suggest a mechanism based on an interaction of two water molecules, both in long-living triplet states. An intermolecular transfer of excitation energy provided a sufficient amount of energy for the dissociation of one water molecule into center dot OH and H center dot radicals. In an aqueous solution of phospholipids, quantum yields of hydroperoxides formed under these irradiation conditions decreased with total effectively absorbed energy (i.e. a dose), similar to the radiation chemical yields obtained during an exposure to ionizing radiation, such as gamma rays from radionuclide sources. Under 253.7 nm irradiation, one center dot OH radical causes a peroxidation of 34 phospholipid molecules. This implicates chain mechanism of the reaction.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

—

Volume of the periodical

19

Issue of the periodical within the volume

43

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

29402-29408

UT code for WoS article

000414773100042

EID of the result in the Scopus database

2-s2.0-85033555655