[The Raman vibrational characteristics and assignments of three Schiff bases]

The Raman vibrational characteristics of three asymmetric Schiff bases were studied in this paper. By referring to the characteristic Raman spectra of substituent benzene and oxamidoxime compounds, the Raman vibrational modes of three Schiff bases were analyzed and assigned, respectively. The difference of their Raman spectra mainly arises from their different vibrational energy level resulting from the C-OH group to most extents. This result is of importance for further investigating the properties of these three new-type Schiff bases.