Table 1.

Variation Band Frequencies Exhibited by Functional Groups in CPT and Lf-CPT

Functional Groups	Band Frequencies in CPT (cm−1)	Band Frequencies in Lf-CPT (cm−1)
N-H	3270	3280
C-H stretch	2949, 2870	2922, 2852
C=O	1760, 1692	1744, 1691
N-H bend	1632	1632
C-H bend	1461, 1377	1462, 1377
C-O	1287, 1228	1277, 1235