Free Radicals in a Single Crystal of Glycyl-glycine at Room Temperature

Summary

The hyperfine splitting of the doublet lines was used to identify the different stable modifications of the glycyl-glycine radicals induced by irradiation of single crystals. Two types of single crystals have been examined. With the aid of theoretical calculations, the radical fragments H₃CCONHĊHCOO⁻ and H₃CCONHĊHCOOH are found as the remains of the radiation lesions at room temperature when the crystals do not contain water of crystallization. If the crystals contain water of crystallization, in addition to these, the radical types ⁺H₃NCH₂CONHĊHCOOH and possibly ⁺H₃NCHCONHCH₂ĊOO⁻ are also found.