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