Question

Will the ring breathing mode in a benzene molecule (ring expands and contracts) appear in the IR spectrum or the Raman spectrum or both?

http://pyvib2.sourceforge.net/res/benzene_breathing.gif

Answer 1

spectrum of simple organic molecules through the Raman spectrum of their liquids. You will analyze ... The lineshape of a Raman band of benzene will be analyzed to determine the lifetime for .... to both “Raman-active” vibrational and rotational transitions. ..... The easily visualized ring breathing (in-plane expansion) modes.

FT-IR spectrum of 2-chloro-6-methyl benzonitrile in the region 400-4000 cm–1 has been ... and assigned to different normal modes of the molecule. .... is noted that thebenzene rings appear a little distorted ..... 1455 cm−1 in both IR and Raman spectrais assigned ... effects of hyperconjugation can also be on C-H bonds.