Electron Spin Resonance of an Irradiated Single Crystal of N-Acetylglycine

Electron spin resonance absorption of an irradiated single crystal of N-acetylglycine was observed at room temperature at 9 kMc and 12 kMc. From the analysis of the anisotropy in the spectroscopic splitting factor and in the nuclear hyperfine interaction constant, a chemical structure[Complex chemical formula]is deduced for the free radical. The C–H bond is in the NCC plane and approximately along the bisector of the NCC angle. The unpaired electron spin density is essentially in a π orbital, about 72% of which is the p orbital of the CH carbon directed perpendicular to the NCC plane.