Abstract
The infrared spectra of bis (L-serinato) copper (II) and -zinc (II) and their isotopic complexes containing metal and hydrogen isotopes have been measured in the region between 4000 and 200cm-1. By referring to the isotope shifts, four bands of the Cu complex at 375, 327, 307, and 255cm-1 have been assigned to the Cu-OOC and the Cu-NH2 stretching vibrations. Two bands of the Zn complex at 230 and 295cm-1 have been assigned to Zn-OOC and Zn-NH2 stretching vibrations, respectively. By comparing the Cu complex with the Zn complex, the vibrations of two anisostructural serinates included in the Zn complex have been distinguished from each other. The structural difference between the two serinates was clearly reflected in the COO deformation vibrations. The Raman measurement for a single crystal of the Zn complex revealed rather small factor group splittings. A normal coordinate analysis for the Zn complex was carried out by using a complete molecular conformation and an intermolecular force field. The result is consistent with the empirical assignments and the experimental isotope shifts.
