EPR of Gamma Irradiated (CH3)3NHClO4, (CH3)3NHBF4 and [(CH3)4N]2ZnCl4 Single Crystals

Abstract

Gamma irradiation damage centres in (CH<inf>3</inf>)<inf>3</inf>NHClO<inf>4</inf>, (CH<inf>3</inf>)<inf>3</inf>NHBF<inf>4</inf> and [(CH<inf>3</inf>)<inf>4</inf>N]<inf>2</inf>ZnCl<inf>4</inf> were investigated by electron paramagnetic resonance spectroscopy at room temperature. The centres were found to be (CH<inf>3</inf>)<inf>3</inf>N+· and the hyperfine structure parameters for methyl protons and the nitrogen nucleus were determined. The results indicated that the (CH<inf>3</inf>)<inf>3</inf>N+· radical wholly performs reorientational motions around its C(3v) axis in addition to the reorientational motions of the methyl groups around their C(3v) axes. These results were compared with the earlier studies on (CH<inf>3</inf>)<inf>3</inf>N+· radical and discussed. Low temperature measurements on the first two of the title compounds were assessed.; Gamma irradiation damage centres in (CH<inf>3</inf>)<inf>3</inf>NHClO<inf>4</inf>, (CH<inf>3</inf>)<inf>3</inf>NHBF<inf>4</inf> and [(CH<inf>3</inf>)<inf>4</inf>N]<inf>2</inf>ZnCl<inf>4</inf> were investigated by electron paramagnetic resonance spectroscopy at room temperature. The centres were found to be (CH<inf>3</inf>)<inf>3</inf>N+· and the hyperfine structure parameters for methyl protons and the nitrogen nucleus were determined. The results indicated that the (CH<inf>3</inf>)<inf>3</inf>N+· radical wholly performs reorientational motions around its C<inf>3v</inf> axis in addition to the reorientatonal motions of the methyl groups around their C<inf>3v</inf> axes. These results were compared with the earlier studies on (CH<inf>3</inf>)<inf>3</inf>N+· radical and discussed. Low temperature measurements on the first two of the title compounds were assessed.