Unstable intermediates. Part 133.—Electron spin resonance studies of 1-monochloro and 1,1-dichloro radicals formed from irradiated alkyl chlorides and α-chlorocarboxylic acids
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 69, 1425-1438
- https://doi.org/10.1039/f29736901425
Abstract
Exposure of various organic chlorides to 60Co γ-rays gave a range of radical products detected by e.s.r., prominent amonst which were 1-chlororadicals. Powder spectra for these radicals at S-, X- and Q-band frequencies are exemplified and interpreted with the aid of results from single crystals. The influence of the quadrupole moment of chlorine on these spectra is discussed. Methyl chloride gave mainly H2ĊCl radicals at 77 K, whilst methylene chloride gave H2ĊCl and HĊCl2 radicals. Monochloroacetic acid gave HĊCl(CO2H) radicals at room temperature. Dichloroacetic acid gave Cl2ĊCO2H radicals, and the amide gave corresponding radicals. In aqueous or methanolic solutions dichloroacetate ions gave both Cl2ĊCO– 2 and ClĊHCO– 2 radicals, but trichloroacetate ions gave only Cl2ĊCO– 2 radicals.Keywords
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