Electron paramagnetic resonance study of radiation damage in isonipecotic acid single crystal

• The ionizing radiation impact on the isonipecotic single crystal was identified.
• The radical produced from the isonipecotic acid single crystal by gamma-irradiation was determined by EPR technique.
• The hyperfine structure splittings of the ring type radical were arised from β-methylene protons.
• The EPR spectra were to be dependent on the orientation of the single crystal in the magnetic field.

The electron spin resonance spectra of the radical produced by gamma-irradiation of a single crystal of isonipecotic acid (piperidine-4-carboxylic acid) were reported, and the structure of the radical was discussed. Isonipecotic acid single crystals were exposed to 60Co-gamma irradiation at room temperature. The irradiated single crystals were investigated by Electron Paramagnetic Resonance (EPR) Spectroscopy between 115 K and 300 K. The spectra were found to be temperature independent. The g values of the radiation damage center observed in isonipecotic acid single crystal and the hyperfine structure constants of the free electron with nearby protons were obtained.

Structure of the radical observed in isonipecotic acid single crystal.Figure optionsDownload as PowerPoint slide