Electron paramagnetic resonance of gamma-irradiated [(CH3)4N]2ZnF4 and [(CH3)4N]2CdF4 single crystals and vibrational spectra of their unirradiated forms

摘要

gamma-Irradiated [(CH3)4N]2ZnF4 and [(CH3)4N]2CdF4 single crystals were investigated by electron paramagnetic resonance(EPR)and vibrational spectroscopy of their unirradiated forms at ambient temperature.It has been found that both compounds indicate the existence of(CH3)3 N~+radicals.The g factors were found to be isotropic and the hyperfine constant for protons of the methyl groups was measured as 28.9 G for this radical in these substances.Each methyl group rotates around its C_(3v)-axis and also rotates around the C_(3v)-axis of the(CH3)3 N~+radical.In addition to these motions,the C_(3v)-axis of the(CH3)3 N~+radical seems to rotate around the z-axis.These results were compared with the earlier studies in(CH3)3 N~+radical and discussed.The vibrational spectra of these two compounds were discussed in relation to other compounds containing tetramethylammonium salts.The assignments of the observed bands were discussed.