As can be seen they
are very similar spectra so that visual inspection of the spectra is
impossible. The major bands in mid-IR can be attributed to the following
vibrations [26,27] from high to low wavenumber, the band
at 3008 cm1 is due to the CH stretching of cis double bonds,
whereas bands centered at 2924 and 2854 cm1 are due to the
antisymmetric and symmetric stretching vibrations, respectively,