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J. Chem. Phys. 47, 292 (1967); http://dx.doi.org/10.1063/1.1711862 (11 pages)
Electron Spin Resonance of the Benzene Positive‐Ion Radical
(Received 6 June 1966)
© 1967 American Institute of Physics
References(a) M. G. Townsend and S. I. Weissman, J. Chem. Phys. 32, 309 (1960)JCPSA6000032000001000309000001;, (b) J. H. Freed, J. Chem. Phys. 43, 1427 (1965)JCPSA6000043000004001427000001.
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We are grateful to the referee for suggesting the interesting possibility that this underlying resonance arises from the benzene dimer radical cation, (C6H6)2+. Such a dimer radical has recently been observed in the case of naphthalene [I. C. Lewis and L. S. Singer, J. Chem. Phys. 43, 2712 (1965)JCPSA6000043000008002712000001]., The peak heights of the underlying resonance are not in good agreement with intensities predicted for the cation dimer but the splitting constant computed using the Colpa-Bolton equation [J. Chem. Phys. 43, 309 (1965)JCPSA6000043000001000309000001] is 2.33 G in good agreement with experiment.
G. Vincow and P. M. Johnson, J. Chem. Phys. 39, 1143 (1963)JCPSA6000039000005001143000001.
The exchange rate may be enhanced by the photolysis of the sulfuric acid solvent to form hydrogen atoms. Trapped hydrogen atoms previously have been studied in the radiolysis of sulfuric acid [see H. Zeldes and R. Livingston, Phys. Rev. 96, 1702 (1954)]. We have indeed observed the ESR of hydrogen atoms at −184 °C in a sample of photoionized benzene in sulfuric acid.
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