International Journal of Interdisciplinary Research
From: Extraction of Indigo dye from Couroupita guianensisand its application on cotton fabric
Wave number (cm−1) | Functional group with mol. motion | Std. synthetic indigo | Purified blue pigment |
---|---|---|---|
3020-3000 | Aromatics C-H Stretch | 3018.39 | 3020.32 |
3400-2400 | Carboxylic acids O-H Stretch | 2399.28 | 2399.00 |
1640-1500 | Amines N-H bend | 1618.17 | 1519.80 |
1430-1290 | C-H in-plane bend | 1425.00 | 1425.30 |
1320-1210 | Carboxylic acids (C-O stretch) | 1215.07 | 1215.07 |
860-680 (s) | Aromatic C-H bending | 754.12 | 757.97 |
730-550 | C-Cl stretch, acid chloride | 669.25 | 669.25 |