Open Access
Table 1.
IR absorption band positions of (I) amorphous NH2CHO on CsI at 12 K, (II) amorphous NH2CHO on amorphous silicates at 16 K, (III) crystalline NH2CHO on CsI at 16 K, and (IV) crystalline NH2CHO on CsI at 170 K.
| Vibration modes | Formamide peak positions (cm−1) | ||||
|---|---|---|---|---|---|
| I | II | III | IV | ||
| νa (N–H) | 3355 | 3335 | 3352 | 3360 | |
| 3287 | 3295 | ||||
| νs (N–H) | 3170 | 3162 | 3174 | 3198 | |
| 3136 | 3149 | ||||
| ν (C–H) | 2878 | 2888 | 2891 | 2890 | |
| 2817 | 2808 | ||||
| ν (C=O) | 1690 | 1681 | 1752 | 1753 | |
| 1703 | 1698 | ||||
| δ (N–H) | 1631 | 1632 | 1653 | 1642 | |
| 1600 | |||||
| δi (C–H) | 1386 | 1386 | 1386 | 1386 | |
| ν (CN) | 1324 | 1323 | 1332 | 1328 | |
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