Paramagnetic Resonance of Cu(II) Complexes in Deuterated Amino Acid Crystals: Dimethylalanine, α-Glycine, and l -Alanine

The ligand nitrogen hyperfine structure in paramagnetic resonance spectra of Cu(II) ions in crystals of three deuterated amino acids has been resolved. In dimethylalanine and α-glycine crystals, the copper complex structure is symmetrical, and the two nitrogen nuclei interact equally with the central ion. In contrast, the structure in l-alanine was found to be deformed, with only one amino group participating in the ligand hyperfine interaction. The g tensor and hyperfine coupling tensors for 63Cu, 65Cu, and ligand 14N nuclei were determined for the Cu(II) complexes in these materials.