Vibrational spectra of trans-N-benzylideneaniline and its isotopomers

Abstract

Solid state and solution infrared and Raman spertra of trans- N-benzylideneaniline and its 15 isotopomers have been analyzed on the basis of a nonplanar molecular model. The normal vibrations are rationalized in terms of local symmetry coordinates of the two phenyl rings and the imine group. The most characteristic modes are discussed in detail. From the analysis of the spectra of a number of isotopomers it was possible to distinguish between aniline and benzylidene ring modes. A comparison with the structurally related trans-stilbene molecule has shown very similar mechanism of mixing of central group and ring vibrations. © 1989 IUPAC