Pulse radiolysis study of the oxidizing radicals in ionic liquid

Complete text of publication follows. Ionic liquids may provide a solution to many technological problems. Their properties, negligible vapor pressure, non-flammability and ability to be reused made them attractive alternatives to classical solvents. Our understanding of this new class of solvents is quite poor in some areas. The radiation chemistry of ILs is one of them. Recently absorption spectra of Br2·-, (SCN)2·- and BrSCN·- was observed. The rate constants of several elementary reactions of the intermediate formation in the solution of dibromoethane, SCN- and Br- in methyltributylammonium bis[(trifluoromethyl)sulfonyl] imide R4NNTf2 were studied by ns pulse radiolysis. The rate constants of the reactions between Br2·- and SCN- are of the same order of magnitude as for Br2·- with chloropromazine in R4NNTf2. The energy of Br- solvation is the driving force of Br2·- formation. At this time the formation of Br2·- radical anions with azide anions were studied by pulse radiolysis. Br2·- + N3- → 2 Br- + N3·. We demonstrated that N6·- can be generated in ionic liquids methyltributylammonium bis[(trifluoromethyl)sulfonyl] imide R4NNtf2 according to a reaction. N3· + N3- ↔ N6·- It reveals board absorption band in the range of 650 - 700 nm. Alfassi et al. have shown that N6·- absorb at 650 nm with extinction coefficient of 8000 M-1cm-1.