The CeN stretching vibrations are usually mixed with other
vibrations and are difficult to identify in the spectrum. Seven CeN
stretching modes are expected to be observed in the (2E)-IPHC
molecule. Three stretching modes were identified at 1330, 1104,
and 1008 cm1 (imidazole) in addition to one CeN stretching mode
at 1360 cm1 (semicarbazide) with a very weak intensity in the FTRaman
spectrum of the (2E)-IPHC molecule. The in-plane and outof-plane
bending modes of CeN vibrations were found in the expected
range.
NeN stretching vibration appeared at 1128 cm1 with a very
weak intensity in the FT-Raman spectrum of the (2E)-IPHC molecule.
While, the computed FT-Raman in-plane and out-of-plane
bending were found at 770 and 67 cm1 with PED values of 66
and 46%, respectively.
4.