Photoinduced Isomerization of Radical Ions. 3. Radical Cations of Cyclopentadiene, Dicyclopentadienes, and 1,3-Bishomocubane Produced in γ-Irradiated Freon Matrices

Article abstract of DOI:10.1021/j100251a020

The radical cations of cyclopentadiene and the three C10H12 systems in the title have been produced in γ-irradiated Freon matrices at 77 K.Electronic and ESR spectroscopy were used to determine the interrelationships among the cations and their photoproducts.The three C10H12^+.'s yielded different photoproducts depending upon the wavelength used for photoexcitation.The photoproduct obtained from endo-dicyclopentadiene cation excited to its first excited state was also obtained by a thermal reaction between the neutral molecule of cyclopentadiene and its radical cation.The product is inferred to be the radical cation of a new dicyclopentadiene.Possible mechanisms of obtaining this new C10H12^+. isomer are discussed.