Photolysis of acetone at 100 - 170 K: an electron spin resonance study of radical formation and decay in the solid state

Hill D.J.T., O'Donnell J.H., Pomery P.J. and Whittaker A.K. (1984) Photolysis of acetone at 100 - 170 K: an electron spin resonance study of radical formation and decay in the solid state. Journal of Photochemistry, 26 4: 255-267. doi:10.1016/0047-2670(84)85045-5


Author Hill D.J.T.
O'Donnell J.H.
Pomery P.J.
Whittaker A.K.
Title Photolysis of acetone at 100 - 170 K: an electron spin resonance study of radical formation and decay in the solid state
Journal name Journal of Photochemistry
ISSN 0047-2670
Publication date 1984-01-01
Year available 1984
Sub-type Article (original research)
DOI 10.1016/0047-2670(84)85045-5
Open Access Status
Volume 26
Issue 4
Start page 255
End page 267
Total pages 13
Publisher ELSEVIER SCIENCE SA LAUSANNE
Language eng
Abstract Solid acetone was photolysed in an electron spin resonance (ESR) spectrometer at 100 - 170 K at wavelengths above 250 nm. The nature of the trapped radicals depended on the photolysis temperature. From 100 to 110 K, methyl and acetyl radicals were formed, with acetyl radicals predominating. Above 110 K, the spectrum consisted of a seven-line signal, attributed to the isopropanol radical CH3Ċ(OH)CH3, resulting from hydrogen atom addition to the carbonyl group. The singlet spectrum of the acetyl radical was also observed, but no methyl radicals. This difference between photolysis below and above 110 K may reflect a solid state transformation. In the range 100 - 110 K, the concentration of acetyl radicals increased linearly with the photolysis time, but the concentration of methyl radicals showed distinct curvature, which could be analysed quantitatively in terms of zero-order formation and first-order disappearance kinetics. The variation in concentration of the CH3Ċ(OH)CH3 radical with the photolysis time at 100 - 170 K was analysed similarly. Acetonyl radicals ĊH2COCH3 were photolabile and hence were observed only as a minor component of the ESR spectra at 100 - 170 K.
Keyword Chemistry, Physical
Chemistry
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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