S. no | API 1 | API 2 | DP1 | DP2 | DP3 | DP4 | Region (cm − 1) | Assignment |
---|---|---|---|---|---|---|---|---|
1 | 3400 | 3502 | 3406.8 | 3515.3 | 3489.5 | 3488.1 | 3500–3300 | N–H stretching |
3328.5 | 3325.4 | 3318.2 | 3327.8 | 3357.1 | 3345.6 | |||
2 | 3157.6 | 3161.9 | 3162.3 | – | 3222.8 | 3228.3 | 3200–3000 | C–H Alkene stretching |
3 | – | – | – | – | 2897.8 | 2868.2 | 2840–3000 | C–H Aliphatic stretching |
4 | – | 2235.7, 2148.3 | – | 2236.2, 2152.5 | 2257.3 | 2368.1 | 2354 | C≡N Stretching |
5 | 1722.8 | – | 1725.3 | – | 1727.6 | 1737.1 | 1680–1630 | C=O Stretching (Amides) |
6 | – | – | – | 1487.8 | – | – | 1600–1450 | C≡C Stretching |
7 | 1287.8 | 1025.5 | 1288.6 | 1028.7 | 1287.9 | 1258.3 | 1350–1000 | C–N Stretching |
1051.7 | 1057.1 | 1087.4 | ||||||
1049.3 |