Molecular Ions in Radiation Chemistry. II. Aromatic-Hydrocarbon Cations in CCl4 at 77°K

Solutions of aromatic hydrocarbons in a polycrystalline matrix of CCl4 at 77°K have been γ irradiated and well-resolved optical absorption spectra measured in the interval 270–2000 mμ. All spectra characteristic of solute are attributed to molecular monopositive ions of benzene, toluene, bi- and triphenyl methanes, biphenyl, o-, m-, and p-terphenyl, bi-, tri-, and tetraphenylethylene, biphenylacetylene, naphthalene, anthracene, phenanthrene, stilbene, diphenylstibene, and 1,3,5-triphenylbenzene. Resonance charge transfer from CCl4+ to CCl4, terminated by transfer from CCl4+ to solute, is postulated.