Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9876353 | Radiation Physics and Chemistry | 2005 | 7 Pages |
Abstract
Radicals and radical ions formed on γ-radiolysis of aromatic carboxylic acids containing a thioether group in the polycrystalline state at 77 K and on subsequent warming over the temperature range of 95-293 K were identified using the electron spin resonance technique. In all carboxylic acids studied, monomeric sulfur radical cations (X-S+-Y-COOH) and radical anions formed by an addition of an electron to the carboxyl group (X-S-Y-COOH)â were detected at 95 K. On further warming over the 150-293 K range various S-centered radicals (XS) and C-centered radicals were observed. The results are discussed in terms of the following competitive reaction pathways: fragmentation, decarboxylation, and deprotonation of the parental monomeric sulfur radical cations. Carbon dioxide was identified and quantified (G=0.2-3.5) in all carboxylic acids exposed to γ-radiation.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
GrazËyna Strzelczak, Anna Korzeniowska-Sobczuk, Krzysztof Bobrowski,