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Photoinduced Transformations in Low-Temperature Matrices Containing Radical Cations of Organotin Compounds

“…A short-term (several minutes) exposure to light at λ ≥ 600 nm results in the disappearance of the absorption band with maximum at 560-570 nm from the optical spectrum. According to our previous results [22], this absorption band is due to CF ···Clion pairs.…”

“…Simultaneously, we observed a decrease in the intensity of the 425-430-nm absorption band (Fig. 2a) accompanied by certain enhancement of absorption in other spectral regions (λ ≤ 360 nm, λ ≥ 500 nm) as a result of the formation of different radical ion intermediates from the matrix [22]. As mentioned above, information on the electronic absorption spectra of organotin radical cations is unavailable.…”

Mechanisms of Radiation-Induced Degradation of CFCl3 and CF2Cl2 in Noble-Gas Matrixes: An Evidence for “Hot” Ionic Channels in the Solid Phase

“…It is a benefit for the primary purpose of the method developed for observation of the solute radical cations, but it makes EPR almost unsuitable for characterization of the CFC related species. Certain information on the structure of intermediates produced from the radiolysis of freons in condensed phase was obtained by UV–vis absorption spectroscopy. ,, Meanwhile, probably, the most useful method is IR spectroscopy, which may provide detailed information on various species produced from CFCs due to strong characteristic bands associated with C–F and C–Cl vibrations. Meanwhile, to our knowledge, IR spectroscopy was quite rarely used in the frame of freon matrix technique .…”

“…It is this reaction that is supposed to be responsible for the ozone layer depletion due to subsequent chain process involving Cl atoms . The photochemistry of CFC molecules in the solid state is much less studied. , Meanwhile, generally speaking, reactions and may be suppressed in rigid media due to cage effect since a heavy chlorine atom should be immobile, at low temperatures. However, the processes induced by high-energy radiation may involve the ionic channels leading to diverse reaction pathways.…”