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Table 2 Assignments of the main infrared absorption bands of the spectra in Fig. 6 [38-43]

From: Deep eutectic solvents: green solvents for the removal of degraded gelatin on cellulose nitrate cinematographic films

Wavenumber (cm−1) Assignment
CN membrane (reference) Film base without gelatin residues in the studied sample  
3659   
3570 3426 νO-H (bound)
2966 2964 νC-H
2928 2924 νsC-H
2904   
  1728 νC = O(40), from camphor(38,41,42) or CN degradation products (e.g. glucolactone, gluconic and glucuronic acids) (5,38,42)
1645 1640 νaO-NO2
1454 1452 δCH2 (40)
1427 1427 δCH2 (38)
1375 1375 δC-H (38)
1278 1276 νsNO2
1160 1161 νaO-C–C
1115 1111 νCO in ring
1065 1061 νa O-C–C attached to the nitro group
1024 1024 νCO
1002 1000 νC-O
945 945 δsCH
918 918 δsCH
837 832 ν-NO
750 750 δO-NO2
694 698 δO-NO2
681 681 Pyranose
  1. ν stretching vibration, νs symmetrical stretching vibration, νa asymmetrical stretching, δ bending vibration and δs scissoring