Electron Spin Resonance of Gamma-Irradiated (CH3)4NPF6 and (CH3)4NBF4 Single Crystals

Abstract

The electron spin resonance spectra of ?-irradiated tetramethylammonium hexafluorophosphate and tetramethylammonium tetrafluoroborate single crystals and powders have been investigated between 120-350 K. The dominant species in both compounds have been attributed to (CH3)3N+ radical. All hyperfine coupling constants of the methyl protons and the nitrogen nucleus have been found to be temperature independent and determined. It is concluded that the motional behaviour of (CH3)3N+ does not differ in tetramethylammonium compounds. The outer lines of the main spectrum of (CH3)4NPF6 have been attributed to PF5- FPO2- radicals and the anisotropic behaviour of the hyperfine copuling constants has been presented.